các bạn sem và cho ý kiến nhá
b1: https://www.youtube.com/watch?v=_PRvsB4bbTo
b2https://www.youtube.com/watch?v=XBcZploM1CI
b3 https://www.youtube.com/watch?v=8PZHJeyF328
b1: https://www.youtube.com/watch?v=_PRvsB4bbTo
b2https://www.youtube.com/watch?v=XBcZploM1CI
b3 https://www.youtube.com/watch?v=8PZHJeyF328