Trinh Quynh Dong Nghi; Nguyen Hoang Than. STUDY ON THE CURRENT TEXTBOOKS ON VIETNAMESE FOR FOREIGNERS AND THE APPLICATION TO THE DEVELOPMENT OF TEXBOOKS ON VIETNAMESE FOR FOREIGNERS AT THE UNIVERSITY OF DANANG - UNIVERSITY OF SCIENCE AND EDUCATION. UED Journal of Social Sciences, Humanities and Education, v. 9, n. 4, p. 77-83, 7 Nov. 2019.