Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
chieu sach » chinh sach, chieu sang, chieu xanh
thanh hung » thanh huong, thanh tung, thanh trung
hung cuong » hung vuong, hong cuong, hung luong
anh quang » anh xquang, anh quan, nhanh quang
cuong tac » cong tac, tuong tac, cuong cac
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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 sach) or (chiet tach)) - anh quang thanh hung cuong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - anh quang thanh hung cuong tac toan cau*.