Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu sach » chieu sach, hieu cach, dien sach
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
van dang » van dong, van dung, van nang
cong tan » cong tac, cong san, cong thanh
toan cao » toan tap
toan ban » van ban

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)) van dang cong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((thanh trung) OR (thanh tung)) van dang cong tan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - ((thanh trung) or (thanh tung)) van dang cong tan ((toan cao) or (toan ban))*.