Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trung voi » trung moi, trung vo, truong von
dung cong » dung trong
trung vi » trung va, trung vu, trung vo
cong san » cong tac
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((trung voi) OR (trung vi)) dung cong san ((than cau) OR (khan cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((trung voi) OR (trung vi)) dung cong san ((than cau) or (khan cap))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((trung voi) OR (trung vi)) dung cong san ((than cau) or (khan cap))*.