Thanh Hue, Ha, and Bui Thi Loan. “DIFFICULTIES IN EDUCATIONAL ACTIVITIES OF SECONDARY SCHOOL TEACHERS IN THE NORTHERN MIDLANDS AND MOUNTAINOUS PROVINCES”. Journal of Science Educational Science 70, no. 1 (January 28, 2025): 101–112. Accessed September 12, 2025. https://hnuejs.edu.vn/es/article/view/409.