Caj nay cac ban faj dug fien ban 1.2 mj lam dc? B1: dang nhap nick1, B2: nhjn len goc man hjh thay 0.2kb thj bam cancel roj dang nhap tjep, B3: khj no hjen ra chu mat ket noj thj bam ok va nhap nick2 vao dang nhap (nick2 chua tao nv) khj no hjen ra chu tao nv thj bam ok la xog, the la nick2 da co tat ca do cua nick 1.
