Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhiet nang » nhiet dong, viet nang, nhieu tang
hanh trang » thanh trung, canh tranh, hanh trinh
trang cua » tranh cua, tang cua, trung cua
cua thong » cua thuong, cua khong, cua tong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (nhiet nang)) - hanh trang cua thong ((cong dan) OR (cong san)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (nhiet nang)) - hanh trang cua thong ((cong dan) OR (cong san)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (nhiet nang)) - hanh trang cua thong ((cong dan) OR (cong san)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (nhiet nang)) - hanh trang cua thong ((cong dan) OR (cong san)) van ban*.