Nguyen Thi , D. A., & Nguyen Thi, C. A. (2026). The Effect of Task-Based Learning on Grammar Competence and Student Engagement among Grade 11 Students: A Case Study at Phong Phu High School in Ho Chi Minh City. TTU Journal of Science, 1(3), 80–87. https://doi.org/10.53901/tjs.2026.v01.issue03.art09