len doi bang nha be qua la qua don gian , ai ma cha lam duoc , toi cung biet xay 2 nha chinh phu o doi 1 co . Chu cai tro len doi bang nha be qua don gian . moi nguoi co ai len doi o phut 11h30 ko . Toi len duoc do (doi 3).co ai len nhanh hon nua chi gium toi voi . co ai la cao thu xin chi gium...