Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, hieu lang
tuong quan » truong quan, thong quan, luong quan
doi chieu » doc hieu, doi chi, ho chieu
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 quan dung cong ((dan toan) or (dan than)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh tuong quan dung cong ((dan toan) OR (dan than)) tap*.