Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hanh tinh » hanh trinh, thanh tinh, canh tinh
ban can » ban dan, ban hang, ban hanh
san van » tan van, luan van, tran van

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 - ((hanh tinh) OR (nhanh tinh)) va nhung cong ((ban can) or (san van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh tinh) OR (nhanh tinh)) va nhung cong ((ban can) OR (san van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh tinh) OR (nhanh tinh)) va nhung cong ((ban can) or (san van)) ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh tinh) OR (nhanh tinh)) va nhung cong ((ban can) or (san van)) ban*.