Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
tuong quang » truong quang, thuong quang, luong quang
chieu sang » chieu sach, chieu xanh, hieu lang
quang dung » quang trung, ung dung, cuong dung
doi chieu » doc hieu, doi chi, ho chieu
vang toan » van toan, quang toan, vang trang
dang toan » dang tran, dan toan, dung toan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh tuong quang dung trong ((vang toan) OR (dang toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh tuong quang dung trong ((vang toan) OR (dang toan)) cau*.