Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
duong va » duong van, dung va, luong va
dan toan » van toan, dan than, manh toan
ban hang » ngan hang

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 - thanh duong va nhung cong ((dan toan) OR (((ban hanh) OR (ban hang)))) cau~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh duong va nhung cong ((dan toan) or (((ban hanh) or (ban hang)))) cau*.