Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung cong » truong cong, trong cong, trung uong
doi chieu » doc hieu, doi chi, ho chieu
tran xuan » tran quang
tran van » luan van
cong san » cong tac
tuan cau » quan cau, tuan cu, thuan cam
toan cau » toan cao, toan ban, toan tap

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 - hanh ((tran xuan) or (tran van)) trung cong san ((tuan cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((tran xuan) OR (tran van)) trung cong san ((tuan cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((tran xuan) or (tran van)) trung cong san ((tuan cau) OR (toan cau))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((tran xuan) or (tran van)) trung cong san ((tuan cau) OR (toan cau))*.