Farmers harvest rice on a paddy field in Ba Dinh village, in Vietnam's central province of Thanh Hoa, about 150 km (93 miles) south of Hanoi May 31, 2012. Demand from the Philippines failed to lift Asian rice prices which are already weighed down by the prospect of rising supplies from major exporting countries and record high stocks held by the Thai government, traders said on Wednesday. REUTERS/Kham (VIETNAM - Tags: AGRICULTURE FOOD BUSINESS)