Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
truong cao » truong dai
hieu sang » chieu sang, hieu lang, hieu quang
cao nhung » cho nhung, cam nhung, cao chung
thanh van » thanh san, thanh toan, thanh phan
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac

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 - hanh truong cao nhung ((cong san) or (cong dong)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - hanh truong cao nhung ((cong san) OR (cong dong)) thanh van.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - hanh truong cao nhung ((cong san) or (cong dong)) thanh van*.