Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh huong, thanh cuong
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
dong cong » duong cong, dung cong, dang cong
ho chieu » theo chieu, hoc thieu, doi chieu
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban 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: ho chieu sang - ((thanh tuong) OR (thanh tung)) van dong cong ((dan than) OR (ban than)) ma~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((thanh tuong) or (thanh tung)) van dong cong ((dan than) or (ban than)) ma*.