Perhaps you should try some spelling variations:
huong quan » luong quan, cuong quan, vuong quan
quan trong » gian trong
hieu lang » chieu sang, hieu quang, nhieu tang
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tai
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 lang - anh huong quan trong cong tan ((((toan cau) or (toan tap))) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - anh huong quan trong cong tan ((((toan cau) OR (toan tap))) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - anh huong quan trong cong tan ((((toan cau) or (toan tap))) or (toan ban))*.