Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh doanh » hang doanh, chinh doanh, doanh doanh
nhung cong » dung cong, thong cong, hang cong
doanh cua » doanh luan
cua nhung » va nhung
tang van » dang van, hoang van, trong van
tan van » tran van, luan van, dang van

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

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