Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong cao, truong dao, luong va
doi hieu » doi chieu, doc hieu, doi hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
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: doi hieu lang - thanh ((truong va) or (truong dai)) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh ((truong va) OR (truong dai)) nhung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh ((truong va) or (truong dai)) nhung cong san toan cao*.