Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
canh tinh » hanh tinh, manh tinh, canh tranh
dung cong » dung trong
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tinh va » tich va, trinh van, trinh vat

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 - canh tinh va ((dang cong) or (dung cong)) dan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tinh va ((dang cong) OR (dung cong)) dan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tinh va ((dang cong) or (dung cong)) dan ((toan cau) or (toan ban))*.