Tran, T. Q. L., & Nguyen, N. M. A. (2025). Effectiveness of Flashcards in Enhancing Vocabulary Learning Among 4th Graders at Hung Long 1 Primary School. The University of Phan Thiet Journal of Science, 3(3), 57-67. https://tapchikhoahocupt.vn/index.php/uptjs/article/view/uptjs-86-2025