Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trung van » truong van, trong van, trung tuan
trong san » trong cac, cong san, dong san
trung va » truong va, trang va, trung ha
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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