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
tung tham » tuong tham, tung pham, luong tham
cung tham » cung than, cung thang, luong tham
tran van » luan van
tan van » tang 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 - thanh ((tung tham) or (cung tham)) nhung cong ((tan van) OR (tran van)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh ((tung tham) OR (cung tham)) nhung cong ((tan van) OR (tran van)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - thanh ((tung tham) or (cung tham)) nhung cong ((tan van) OR (tran van)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh ((tung tham) or (cung tham)) nhung cong ((tan van) OR (tran van)) cau*.