Perhaps you should try some spelling variations:
hanh cong » thanh cong, hang cong, hanh dong
ban hanh » ban hang
cong khi » cong thai, khong khi, co khi
su canh » suc canh, su can, su anh
tranh o » tranh co, trang o, trang do
trinh o » trinh do, trinh co, trinh mo
tu ban » thu ban, te ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( su canh ((tranh o) OR (trinh o)) khi đong luc ) OR ( tu ban hanh cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (( su canh ((tranh o) or (trinh o)) khi đong luc ) or ( tu ban hanh cong khi đong luc ))*.