Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
khoan cam » khoa cam, khoan va, phan cam
doc hieu » toc thieu, hoc thieu, hoc hien
tang van » dang van, hoang van, trong van
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac
tang va » trang va, thang va, tang vat

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 - anh ((tang va) or (tang van)) trong cong tan ((than cap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - anh ((tang va) OR (tang van)) trong cong tan ((than cap) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - anh ((tang va) or (tang van)) trong cong tan ((than cap) or (khoan cam))*.