Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
phuong van » phung van, phuong lan, phuong va
cach dang » cach mang, cac dang, cach dung
phong van » phung van, thong van, phong va
cong sach » ong sach, song sach, duong sach
ho chieu » theo chieu, hoc thieu, mot chieu

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 - cach dang su dung ((phuong van) or (phong van)) cong sach~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - cach dang su dung ((phuong van) OR (phong van)) cong sach.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - cach dang su dung ((phuong van) or (phong van)) cong sach*.