Thi Lai, T., Thi Hong Lien, N. and Ngoc Vu, N. 2021. FLIPGRID APP FOR TEACHING SPEAKING SKILLS: STUDENTS’ PERCEPTIONS AND PERFORMANCE IMPACT. VNU Journal of Foreign Studies. 37, 6 (Dec. 2021), 155-167. DOI:https://doi.org/10.25073/2525-2445/vnufs.4746.