Tieng Anh:Task-based language teaching (TBLT) has been recently implemented as a potential language teaching method for language education in Vietnam. However, research into the training for teachers on the application of TBLT has remained scarce. This study, therefore, aims to examine how Vietnamese in-service teachers implement the insights from a one-shot training program on TBLT in their classroom-based teaching practices. Three in-service teachers at a university in Vietnam participated. Data were collected through a video-taped classroom observation activity. Findings indicate that the teachers on the whole were unable to transfer the theoretical knowledge of TBLT principles that they had built up during the training program into their actual teaching practices. In addition, the teachers failed to perform TBLT teaching roles throughout the lesson. Accordingly, this study suggests pedagogical implications and insights with regard to the issue of teacher training on TBLT in the context of language education in Vietnam.Tieng Viet:Phuong phap giang day co ten la "Task-based language teaching" (TBLT) duoc thuc thi gan day tai Viet Nam va duoc danh gia la mot phuong phap giang day ngon ngu rat tiem nang. Tuy nhien, den nay van khong co nhieu nghien cuu tim hieu ve hoat dong dao tao, tap huan giao vien de co the ung dung TBLT vao hoat dong giang day tren lop. Vi the, nghien cuu nay tap trung vao viec tim hieu muc do hieu qua cua hoat dong tap huan, cu the la hinh thuc tap huan ngan han (one-shot training) cho giao vien ve phuong phap TBLT, lieu giao vien co the ung dung duoc TBLT vao dieu kien giang day thuc te tren lop sau khoa tap huan hay khong. Ba giao vien giang day mon tieng Anh tai mot truong dai hoc o Viet Nam dong y tham gia vao nghien cuu. So lieu duoc thu thap thong qua hoat dong quay video ve hoat dong giang day cua giao vien tren lop. Ket qua nghien cuu cho thay nhin chung giao vien khong co kha nang thuc thi kien thuc TBLT (nguyen tac cot loi, vai tro giao vien) ma ho da duoc tap huan vao hoat dong giang day thuc te tren lop hoc cua minh. Tu ket qua do, nhom nghien cuu de xuat phuong huong, giai phap va ke hoach hanh dong cho hoat dong tap huan giao vien trong viec ung dung, thuc thi TBLT trong dieu kien giang day ngoai ngu tai Viet Nam.