Perhaps you should try some spelling variations:
cuong quan » luong quan, vuong quan, luong quang
quan trong » gian trong
hieu lang » chieu sang, hieu quang, nhieu tang
anh cuong » manh cuong, anh huong, anh cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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