Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
cong sang » cong san, cong lang, cong vang
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - thanh ((trung va) or (trung ha)) nhung cong sang ((than cau) OR (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh ((trung va) OR (trung ha)) nhung cong sang ((than cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((trung va) or (trung ha)) nhung cong sang ((than cau) OR (phan cau))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((trung va) or (trung ha)) nhung cong sang ((than cau) OR (phan cau))*.