Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tran phung » tran phuong, trang phung, tran hung
phung cong » nhung cong, phong cong, nhung chong
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, nhanh quang, tinh quang
anh quan » anh tuan, ban quan, anh nhan
tac toan » tam toan, hach toan, tich toan
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 - ((anh quang) or (anh quan)) tran phung cong ((tac toan) OR (tap toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh quang) OR (anh quan)) tran phung cong ((tac toan) OR (tap toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((anh quang) or (anh quan)) tran phung cong ((tac toan) OR (tap toan)) tap".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) or (anh quan)) tran phung cong ((tac toan) OR (tap toan)) tap*.