Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan hung » luan chung, lan hung, luan ung
hung cong » nhung cong, hung cuong, phung cong
chi tach » chiu trach, chi thanh, che tac
cong san » cong tac
san than » sang than, san thanh, ban than
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: doi ((chi tach) or (chiet tach)) - hanh tang luan hung cong san than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi tach) OR (chiet tach)) - hanh tang luan hung cong san than cap.
• Adding a wildcard symbol may retrieve word variants: doi ((chi tach) or (chiet tach)) - hanh tang luan hung cong san than cap*.