Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tran trong » gian trong, quan trong, tran hong
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, nhanh quang, tinh quang
anh quan » anh tuan, ban quan, anh nhan
tap toan » tap quan, bai toan
tap doan » tap quan

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 - ((anh quan) or (anh quang)) tran trong cong ((tap toan) or (tap doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh quan) OR (anh quang)) tran trong cong ((tap toan) OR (tap doan)) cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quan) or (anh quang)) tran trong cong ((tap toan) or (tap doan)) cao*.