xa ch u1ed3ng th u1ee7 d acirc m l ecirc n u0111 u1ec9nh 3
v u1ee3 ch u1ed3ng phang nhau
Ng u1ecdc di u1ec5m d acirc m 02
Khi v u1ee3 d acirc m n u1ee9ng l u1ed3n