Perhaps you should try some spelling variations:
dong thanh » truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua dang » cua cong, cua ban
cong tan » cong tac, cong san, cong thanh
ho hieu » ho chieu, hoi hieu, nho hieu
ban cau » bang cau, ban can, van cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tranh cua dang ((cong tan) or (dong thanh)) ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh cua dang ((cong tan) OR (dong thanh)) ban cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh cua dang ((cong tan) or (dong thanh)) ban cau*.