L? m c cg cmua bu?c ph?i m?t chi?c r?ng th c?ng khg c?n ph?i ??i l?i ? nh ?a d?ng c ch? em cs? th h m?c r?ng l?m. Chuy?n r?ng h?n m?t t ch?c ch?n r?ng khg h? l v?n ?? so v?i c b?n tr? r?i ?