Nguyễn D. A SURVEY OF QUESTION TYPES IN ELEMENTARY-LEVEL VIETNAMESE LANGUAGE TEXTBOOKS FOR FOREIGN LEARNERS: FREQUENCY OF OCCURRENCE AND EXPLANATION OF STRUCTURE AND MEANING. Tạp chí Khoa học [Internet]. 2025 Jun. 30 [cited 2025 Jul. 15];22(6). Available from: https://journal.hcmue.edu.vn/index.php/hcmuejos/article/view/5061