... Đinh Tấn Bảo and my colleagues of Foreign Languages Department, Quang Ngai Teachers Training College for their attention and encouragement.I am appreciative of all those who have kindly ... gratitude to all my teachers at College of Foreign Languages, Vietnam National University-Hanoi for their valuable lectures. And their knowledge, their thoughtfulness as well as their sympathy ... debt to Assoc. Prof. Dr. Lê Hùng Tiến and the staff members of Postgraduate Department, College of Foreign Languages, VNU-Hanoi for their enthusiastic support.I am sincerely grateful to Mr....