Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
tong cong » trong cong, cong cong, dung cong
trang va » hang va
tran van » luan van
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 - hanh ((trang va) or (tran van)) tong cong ((dan than) or (ban than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh ((trang va) OR (tran van)) tong cong ((dan than) OR (ban than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh ((trang va) or (tran van)) tong cong ((dan than) or (ban than)) ban*.