Nhac TH. POSITIONING THEORY AS A THEORETICAL FRAMEWORK IN ENGLISH AS A MEDIUM OF INSTRUCTION: INSIGHTS FROM EMPIRICAL RESEARCH. JFS [Internet]. 2026 Aug. 27 [cited 2026 Aug. 31];42(4):71-8. Available from: https://jfs.ulis.vnu.edu.vn/index.php/fs/article/view/5704