Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

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