Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
hoang van » hang va
dan van » dang van, doan van, dao 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 tranh cua nhung cong ((dan van) or (hoang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chinh sach)) - hanh tranh cua nhung cong ((dan van) OR (hoang van)) ban.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chinh sach)) - hanh tranh cua nhung cong ((dan van) or (hoang van)) ban*.