VIETNAM NATIONAL UNIVERSITY – HANOI COLLEGE OF FOREIGN LANGUAGES DISAGREEING IN ENGLISH AND VIETNAMESE: A PRAGMATICS AND CONVERSATION ANALYSIS PERSPECTIVE By KIEU, THI THU HUONG A thesis submitted in conformity with the requirements for the degree of Doctor of Philosophy Supervisors: Assoc. Prof. Dr. Hoang Van Van Assoc. Prof. Dr. Phan Van Que HANOI - 2006