Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung van » truong van, trung va, trung tuan
trong van » trong cac
trong dan » trong dang, trong san, trong tan
ho chieu » theo chieu, hoc thieu, doi chieu
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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