Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
cua nhung » va nhung
cong van » cong vang, cong san, song van
toan cao » toan ban
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - doanh doanh cua nhung cong van ((toan cao) OR (toan tap))~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - doanh doanh cua nhung cong van ((toan cao) or (toan tap))*.