Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trong » hanh trang, anh trong, hinh trong
cong thanh » dong thanh, cong trinh, truong thanh
trong van » trong cac
van nhung » van nhuong, va nhung, van hung
toc hieu » toc thieu, doc hieu, hoc thieu
cong tan » cong tac, cong san, cong ty
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: toc hieu quang - hanh trong van nhung ((cong tan) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu quang - hanh trong van nhung ((cong tan) OR (cong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: toc hieu quang - hanh trong van nhung ((cong tan) or (cong thanh)) toan cao*.