Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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: doi ((chieu tinh) OR (hieu lang)) - thanh tuong ((cua dung) OR (cua dang)) cong tap toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu tinh) or (hieu lang)) - thanh tuong ((cua dung) OR (cua dang)) cong tap toan ban~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (hieu lang)) - thanh tuong ((cua dung) OR (cua dang)) cong tap toan ban*.