Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
dong cong » duong cong, dung cong, dang cong
van thanh » ban thanh, van tuan
doi hieu » doi chieu, doc hieu, doi hien
cua dong » chua dong, cua cong, cua dang
van toan » van tuan, van tan, manh toan

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: doi hieu lang - canh tranh cua dong cong ((van toan) OR (van thanh)) ban~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - canh tranh cua dong cong ((van toan) or (van thanh)) ban*.