CHO SO CO 4 CHU SO KHAC NHAU TRONG DO TICH CUA CHU SO HANG NGHION VA HANG DON VI BANG 36 , TICH CUA CHU SO HANG TRAM VA HANG CHUC BANG 35
A.TIM CAC CHU SO CUA SO DO
B.VIET SO LON NHAT VA SO BE NHAT CO BON CHU SO DO
CACH LAM NUA NHA... GIUP TO VOI NHA
