Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
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 - canh tranh cua nhung ((cong dan) OR (cong tac)) ((toan cau) OR (toan cao))~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh cua nhung ((cong dan) or (cong tac)) ((toan cau) or (toan cao))*.