Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
nhung don » nhung van
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
nhung bo » nhung bi, nhung bai, trung bo

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: ho chieu sach - canh trinh luan ((((nhung don) OR (nhung bo))) OR (dung cong)) luan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - canh trinh luan ((((nhung don) OR (nhung bo))) or (dung cong)) luan van ban~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh trinh luan ((((nhung don) OR (nhung bo))) or (dung cong)) luan van ban*.