Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
ho hieu » ho chieu, hoi hieu, nho hieu
van cau » van dau, van hau, van chat
ban cau » bang cau, ban can, ban dau

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) OR (hang cong)) thanh ((van cau) OR (ban cau))~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tranh cua ((nhung cong) or (hang cong)) thanh ((van cau) or (ban cau))*.