Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
doc hieu » toc thieu, hoc thieu, hoc hien
cap dung » ap dung, cao dung, chan dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
cao ung » cao dung, cac ung, cho ung

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 - ((manh hung) or (anh huong)) ((cap dung) or (cao ung)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((manh hung) OR (anh huong)) ((cap dung) OR (cao ung)) cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((manh hung) or (anh huong)) ((cap dung) or (cao ung)) cong tac toan tap*.