Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
tinh cua » trinh cua, sinh cua, tinh chat
dan ban » van ban, can ban, dan ba
ban can » ban dan, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (chiet tach)) - hanh tinh cua ((bang cong) or (hang cong)) dan ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (chiet tach)) - hanh tinh cua ((bang cong) OR (hang cong)) dan ban can.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (chiet tach)) - hanh tinh cua ((bang cong) or (hang cong)) dan ban can*.