У вашего броузера проблема в совместимости с HTML5
Video nay se day ky lai tieng S va T de ghep ra thanh tieng ST. Sau do, se day cach lam ra tieng TS. Sau khi tap duoc tieng TS roi, se co nhieu vi du de tap lai noi va nghe. Co y kien gi, thi xin gop!
Xin xem may trang under here! check out the following pages below!
My other videos: https://www.youtube.com/user/thaywalcus/videos
Thai Vi Lan: https://www.youtube.com/channel/UC4P4Jim26NE_3I-weqWBw5Q/videos
Minh Tri: https://www.youtube.com/user/nmt138/videos