Bui, Tuan Anh, Diem-Chinh Thi Ho, Chi Hong Nguyen, Huynh Nhu Phan, and Linh Yen Nguyen. 2020. “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 (4):59-68. https://doi.org/10.52296/vje.2020.81.