Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu sang » chieu sach, chieu xanh, hieu lang
hoi chieu » doi chieu, ho chieu, hai chieu
tuong va » truong va, thuong va, luong va
va trong » va truong, va thong, va tuong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
quang » quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoi chieu sang - thanh tuong va trong ((cong tan) or (cong tac)) tran quang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi chieu sang - thanh tuong va trong ((cong tan) OR (cong tac)) tran quang.
• Adding a wildcard symbol may retrieve word variants: hoi chieu sang - thanh tuong va trong ((cong tan) or (cong tac)) tran quang*.