Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu sach » chieu sach, hieu cach, dien sach
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((thanh trung) or (thanh tung)) ((va hang) or (va nang)) cong san than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((thanh trung) OR (thanh tung)) ((va hang) OR (va nang)) cong san than cap.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((thanh trung) or (thanh tung)) ((va hang) or (va nang)) cong san than cap*.