Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
tung tuan » trung tuan, hung tuan, quang tuan
tuan dang » tran dang, tuan bang, tuan dung
dang cong » dung cong
tap toan » tap doan, tap quan, bai toan

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 - thanh tung tuan dang cong ((tap toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh tung tuan dang cong ((tap toan) OR (tan tran)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh tung tuan dang cong ((tap toan) or (tan tran)) cau*.