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