Chuy\u1ec7n l\u1ea1: Tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc c\u1ed1 t\u00ecnh n\u00e2ng \u0111i\u1ec3m chu\u1ea9n cao \u0111\u1ec3 \u0111\u00e1nh r\u1edbt th\u00ed sinh<\/a><\/blockquote><\/iframe>