Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
dien anh » tieng anh, dien dan
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
tac doan » tap doan, tan doan, thai doan
doan cap » doanh cao, dan ca, toan cao

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: theo ((dien anh) OR (hieu lang)) - canh tranh va thuong cong tac doan cap~.
• Adding a wildcard symbol may retrieve word variants: theo ((dien anh) or (hieu lang)) - canh tranh va thuong cong tac doan cap*.