Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh doanh » chinh doanh, doanh doanh, kinh doanh
hanh doanh » hang doanh, chinh doanh, doanh doanh
doi chieu » doc hieu, doi chi, ho chieu
bang van » dang van, lang van, bang va
tang van » dang van, hoang van, trong van

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

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