Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
nang quan » ban quan, nang suat
dung cong » dung trong
mang qua » mang cua, mang vua, tang quan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh ((mang qua) OR (nang quan)) dung cong tap toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh ((mang qua) OR (nang quan)) dung cong tap toan cau*.