Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
tuong quang » truong quang, thuong quang, luong quang
chieu sach » chinh sach, chiet tach, chieu sang
quang dung » quang trung, ung dung, cuong dung
hieu lang » chieu sang, hieu quang, nhieu tang
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
phan cac » nhan cach, phan dau, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu sach)) - thanh tuong quang dung ((cong ban) OR (cong tan)) phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sach)) - thanh tuong quang dung ((cong ban) OR (cong tan)) phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (chieu sach)) - thanh tuong quang dung ((cong ban) OR (cong tan)) phan cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu sach)) - thanh tuong quang dung ((cong ban) OR (cong tan)) phan cac*.