Nội dung em post ở đây ạ.
http://www.hdvietnam.com/diendan/170-su-kien-hdvietnam/723713-kinh-moi-tham-du-offline-giai.html
http://www.hdvietnam.com/diendan/170-su-kien-hdvietnam/723713-kinh-moi-tham-du-offline-giai.html