Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trang va » hang va
tran van » luan van
dan chan » dan gian, dan ca, van chat
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: doi chieu sach - thanh ((trang va) OR (tran van)) nhung cong ((dan chan) or (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((trang va) OR (tran van)) nhung cong ((dan chan) OR (ban than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((trang va) OR (tran van)) nhung cong ((dan chan) or (ban than)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((trang va) OR (tran van)) nhung cong ((dan chan) or (ban than)) cau*.