Recent studies in Vietnam found that metacognitive strategies were employed with consistent practice to enhance student learning outcomes significantly. Positive perceptions of reflective teaching practices contribute to teachers’ professional development regarding teaching quality and student outcomes. This study aimed to examine common self-reflecting strategies that were most frequently implemented in the teaching process to improve teaching quality. The tools of the questionnaire and semi-structured interviews were employed to collect quantitative and qualitative data for this descriptive study. The participants were EFL teachers teaching at high schools in most of the provinces in the Mekong Delta. The research findings showed that teachers perceived common strategies of self-reflecting, although they did not often apply them in their teaching performance. Regarding this, they focused on implementing peer observation, students’ feedback, and teachers’ diaries instead of video – audio recordings in their teaching. Some pedagogical implications and research suggestions about the effectiveness of the application of self-reflecting strategies in improving teachers’ teaching or developing their profession were proposed in the study.