Perhaps you should try some spelling variations:
tranh viet » tran viet, trinh viet, trang viet
viet chung » viet hung, viet phuong, viet thuong
hieu lang » chieu sang, hieu quang, nhieu tang
cong bang » cuong bang, dong bang, hong bang
thanh hai » thanh phan, thanh hoa, thanh san
cong ban » cong san, cong tan, cong dan
ho hieu » ho chieu, hoi hieu, nho hieu

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 viet chung ((cong ban) or (cong bang)) thanh hai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh viet chung ((cong ban) OR (cong bang)) thanh hai*.