Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
cong quang » luong quang, thong quang, duong quang
quang toan » quang tuan, quang tran, quang doan
vat dung » van dung, viet dung, mat duong
toan cao » toan ban, toan tap
va dung » van dung, va duong, va ung

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)) - thanh trung ((va dung) OR (vat dung)) cong quang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - thanh trung ((va dung) OR (vat dung)) cong quang toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chiet tach)) - thanh trung ((va dung) OR (vat dung)) cong quang toan cao*".