Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doc chieu » doc hieu, doi chieu, toc thieu
trong van » trong cac
khoan cam » khoa cam, khoan va, phan cam
tang van » dang van, hoang van, tang luan
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac

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

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