Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, hieu van
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 ((nhieu tang) OR (hieu lang)) - hanh tranh va thong cong ((dan toan) OR (van toan)) ban~.
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu lang)) - hanh tranh va thong cong ((dan toan) or (van toan)) ban*.