Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
anh trong » anh thuong, dinh trong, lang trong
trong xay » thong xay, trong cac, trong ca
dung cong » dung trong
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: ho ((chinh sach) or (hieu lang)) - anh trong xay dung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - anh trong xay dung cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - anh trong xay dung cong san toan cao*.