Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
tuong va » truong va, thuong va, luong va
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.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - thanh tuong va nhung cong ((dan toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tuong va nhung cong ((dan toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tuong va nhung cong ((dan toan) or (van toan)) cao*.