President Truong Tan Sang sent complimentary letters to three teachers 30/11/2014 (VOVworld) - President Truong Tan Sang sent complimentary letters to teachers Nguyen Tra (Dong Da District, Hanoi), Nguyen Thi Thong (Hau Loc District, Thanh Hoa) and Le Trung Sung (Binh Thuy District,...