INTRODUCTION OF PH.D THESIS BY NGUYEN DANH VU “POLITENESS AS AN ASPECT OF LINGUISTICS AND CULTURE AND SOME COMMUNICATIVE MEANS IN VIETNAMESE”. Journal of Foreign Language Studies, [S. l.], n. 07, p. 69–70, 2024. DOI: 10.56844/tckhnn.07.311. Disponível em: http://journals.hanu.edu.vn/index.php/tckhnn/article/view/311. Acesso em: 15 jan. 2026.