Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
luan nhung » luan chung, luan hung, quan nhung
hieu lang » chieu sang, hieu quang, nhieu tang
tranh ban » trinh ban, tranh hang, tranh luan
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty

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: hoc hieu lang - hanh doanh luan nhung ((cong tan) OR (cong tac)) tranh ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh doanh luan nhung ((cong tan) or (cong tac)) tranh ban*.