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How Did Vietnamese Teachers Observe Lessons? Active, Passive, and Middle Voices in Classroom Observation. JCEPP [Internet]. 18 Tháng Tư 2022 [cited 3 Tháng Tư 2026];6(Special Issue):58-69. Available at: https://ojs35.mpos.io.vn/index.php/journal/article/view/177