vào đây xem nhé http://vn.news.yahoo.com/nh%E1%BB%AFng-h%C3%ACnh-%E1%BA%A3nh-c%E1%BB%B1c-%C4%91%E1%BB%99c-ch%E1%BB%89-c%C3%B3-%E1%BB%9F-170435317.html