A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a peach blossom flower field in Hanoi, Vietnam, January 21, 2020. REUTERS/Kham

A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a peach blossom flowers field in Hanoi, Vietnam, January 21, 2020. REUTERS/Kham

A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a peach blossom flower field in Hanoi, Vietnam, January 21, 2020. REUTERS/Kham

A woman dries incense in preparation for Tet, the traditional Vietnamese Lunar New Year festival, in Hong Chau village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A dog lies next to drying incense in preparation for Tet, the traditional Vietnamese Lunar New Year, in Hong Chau village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A resident arranges a pile of banh chung, or rice cakes, ahead of Tet, the traditional Vietnamese Lunar New Year festival, in Tranh Khuc village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A woman mixes green bean powder and pork to make banh chung, or rice cakes, for sale ahead of Tet, the traditional Vietnamese Lunar New Year festival, in Tranh Khuc village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A man dries incense in preparation for Tet, the traditional Vietnamese Lunar New Year festival, in Hong Chau village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A man wraps banh chung, or rice cakes, for sale ahead of Tet, the traditional Vietnamese Lunar New Year festival, in Tranh Khuc village, outside Hanoi, Vietnam February 8, 2018. REUTERS/Kham

A farmer carries branches of peach blossom flowers for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A farmer carries branches of peach blossom flowers for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A farmer tends peach blossom flowers for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A farmer transports a kumquat tree for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A Vietnamese woman, wearing the traditional "ao dai" long dress, poses for a photo along the peach blossom flowers ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A farmer waters kumquat trees for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam February 7, 2018. REUTERS/Kham

A woman prays at a buddhist pagoda during Tet (Vietnamese lunar new year celebrations) in Da Nang city January 28, 2017. REUTERS/Kham

Pilgrims pray at a buddhist pagoda during Tet (Vietnamese lunar new year celebrations) in Da Nang city January 28, 2017. REUTERS/Kham

An woman wearing a Vietnamese traditional conical hat while she serves at a cafe during Tet (Vietnamese lunar new year celebrations) in Da Nang city January 28, 2017. REUTERS/Kham

Tourists visit heritage town of Hoi An during Tet (Vietnamese lunar new year celebrations), January 28, 2017. REUTERS/Kham

Kim Chi Tran places incense on an unknown grave she believes belongs to her relative killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, Vietnam January 26, 2017. REUTERS/Kham

Thai An places incense on the unknown graves of people killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, January 26, 2017. REUTERS/Kham

Kim Chi Tran (L), next to her son Thai An, prays with incense near an unknown grave they believe belongs to their relative killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, January 26, 2017. REUTERS/Kham

Kim Chi Tran (R), next to her son Thai An, looks for the grave of a relative killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, Vietnam January 26, 2017. REUTERS/Kham TPX IMAGES OF THE DAY

Flowers are laid on the unknown grave of someone killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is a tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, Vietnam January 26, 2017. REUTERS/Kham

Flowers are laid on the unknown grave of someone killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is a tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An province, Vietnam January 26, 2017. REUTERS/Kham

Kim Chi Tran (R), next to her son Thai An, places incense on an unknown grave they believe is their relative killed during the Vietnam War, ahead of the Vietnamese lunar new year (or Tet) when it is tradition to visit the graves of loved ones, at the Viet-Laos national cemetery in Nghe An Province, Vietnam January 26, 2017. REUTERS/Kham

A man transports kumquat trees for sale ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

A farmer stands among kumquat trees as she waits for customers ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

A couple transports peach blossom flowers to the market for sale ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

Women, wearing traditional 'ao dai' dress, pose for a photo next to peach blossom flowers ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

A farmer sits next to kumquat trees as she waits for customers ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

A farmer walks past peach blossom flowers as she waits for customers ahead of Vietnamese "Tet" (the lunar new year festival) in a field in Hanoi January 22, 2017. REUTERS/Kham

A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a peach blossom flowers field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese farmer brings peach blossom flowers to the market for sale ahead of the Vietnamese "Tet" (Lunar New Year festival) in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese farmer walks along peach blossom flowers as she waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) in a peach blossom flowers field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese farmer waits for customers ahead of the Vietnamese "Tet" (Lunar New Year festival) at a peach blossom flowers field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

Vietnamese farmers bring peach blossom flowers to the market for sale ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese farmer carries his daughter while waiting for customers ahead of the Vietnamese "Tet" (Lunar New Year festival), at a peach blossom flowers field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese couple, wearing the traditional "ao dai" long dresses, pose for photos along peach blossom flowers ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese woman, wearing the traditional "ao dai" long dress, poses for photos along peach blossom flowers ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham

A Vietnamese woman, wearing the traditional "ao dai" long dress, poses for photos along peach blossom flowers ahead of the Vietnamese "Tet" (Lunar New Year festival), in a field in Hanoi, Vietnam, February 2, 2016. REUTERS/Kham TPX IMAGES OF THE DAY

Veterans carry a portrait of late President Ho Chi Minh and Vietnamese flag around the Nem Thuong village during a festival in Bac Ninh, north of Hanoi, February 24, 2015. Organized by the villagers, the festival is held on the sixth day of the first month of the lunar calendar to worship the village's deity Doan Thuong, an anti-royal military general who lived in 13th century. Every year, thousands of people from the village and nearby villages will gather to smear the blood of pig on their banknotes in the belief that it would bring luck in the new year. The festival is known as the most brutal in the country and is condemned by many, including some who called on the government to stop the festival. REUTERS/Kham (VIETNAM - Tags: ANIMALS SOCIETY MILITARY POLITICS)

A woman walks past a table on which decorations made with replica euro and U.S. dollar notes called money trees, are seen for sale on a street in Hanoi February 12, 2015. Money trees, made with replica money, are believed to bring luck to families, and are used to decorate homes during the Vietnamese Lunar New Year festival known as "Tet", which will take place from February 14 to 24. This Lunar New Year marks the Year of the Sheep (also known as the Year of the Goat or Ram). REUTERS/Kham (VIETNAM - Tags: BUSINESS SOCIETY)

People pose for souvenir photos along peach blossom flowers at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY AGRICULTURE ENVIRONMENT)

A woman carries a branch of peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY AGRICULTURE ENVIRONMENT)

Farmers carry branches of peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE ENVIRONMENT SOCIETY)

A farmer tends to peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE ENVIRONMENT SOCIETY)

A couple tends to peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE ENVIRONMENT SOCIETY)

A farmer sits on a field of peach blossom flowers while waiting for customers in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE ENVIRONMENT SOCIETY)

A farmer tends to peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE ENVIRONMENT SOCIETY)

A woman carries branches of peach blossom flowers for sale at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY AGRICULTURE ENVIRONMENT)

A man rides a bicycle among peach blossom flowers at a field in Hanoi February 6, 2015. The peach blossom, believed to bring luck to families, is used to decorate homes during the Vietnamese "Tet" (Lunar New Year festival), which will take place from February 14 to February 24. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE SOCIETY ENVIRONMENT)

A labourer makes incense in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet runs from February 14 to 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

Incense is laid out to dry in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet runs from February 14 to 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

Incense is laid out to dry in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet runs from February 14 to 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

A man dries incense in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet runs from February 14 to 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

A man dries incense in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet is from February 14 till 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

A labourer makes incense in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet is from February 14 till 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)

A labourer packs incense in preparation for Tet, the traditional Vietnamese lunar new year, in Hong Chau village, outside Hanoi January 29, 2015. Tet is from February 14 till 24. REUTERS/Kham (VIETNAM - Tags: SOCIETY)