Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
dan than » ban than, van than, dan toan
dan chan » dan gian, van chat
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - hanh tranh va thong cong ((dan than) OR (((dan chan) OR (dan ca)))) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh tranh va thong cong ((dan than) or (((dan chan) OR (dan ca)))) cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tranh va thong cong ((dan than) or (((dan chan) OR (dan ca)))) cau*.