Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh nhan » thanh nhan, danh nhan, anh nhan
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu
va cong » tai cong, cua cong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((hanh nhan) or (cang thang)) ((va cong) or (he thong)) cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh nhan) OR (cang thang)) ((va cong) OR (he thong)) cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh nhan) or (cang thang)) ((va cong) or (he thong)) cong san toan ban*.