Nguyen Thi , D. A., and C. A. Nguyen Thi. “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, vol. 1, no. 3, Sept. 2026, pp. 80-87, doi:10.53901/tjs.2026.v01.issue03.art09.