Perhaps you should try some spelling variations:
huong quan » luong quan, cuong quan, vuong quan
quan trong » gian trong
hieu sang » chieu sang, hieu lang, hieu quang
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tcan cau » toan cau, toan cao, van cau
can cau » van cau, ban cau, ca cau

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 sang - anh huong quan trong cong tan ((tcan cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - anh huong quan trong cong tan ((tcan cau) OR (can cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - anh huong quan trong cong tan ((tcan cau) or (can cau))*.