Bui, Tuan Anh, Diem-Chinh Thi Ho, Chi Hong Nguyen, Huynh Nhu Phan, and Linh Yen Nguyen. “Text Mining in the Trend of Education 4.0: A Study on Clustering Mathematical Terms of Algebra Textbooks in Vietnamese High Schools”. Vietnam Journal of Education 4, no. 4 (December 30, 2020): 59–68. Accessed March 28, 2024. https://vje.vn/index.php/journal/article/view/81.