Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh xay » trinh xay, trong xay, manh xay
trong van » trong cac
doi hieu » doi chieu, doc hieu, doi hien
song van » hoang van, duong van, dang van
cong san » cong tac
tuan ban » tuan bang, toan ban, luan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh tranh xay dung ((((song van) OR (trong van))) OR (cong san)) tuan ban~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - canh tranh xay dung ((((song van) or (trong van))) or (cong san)) tuan ban*.