INTRODUCTION OF PH.D THESIS BY NGUYEN DANH VU “POLITENESS AS AN ASPECT OF LINGUISTICS AND CULTURE AND SOME COMMUNICATIVE MEANS IN VIETNAMESE”. TCKHNN [Internet]. 2024 Dec. 30 [cited 2026 Jan. 15];(07):69-70. Available from: http://journals.hanu.edu.vn/index.php/tckhnn/article/view/311