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

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi 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 chi sach - hanh ((tran xuan) OR (tran van)) trung cong san ((tuan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh ((tran xuan) or (tran van)) trung cong san ((tuan cau) or (toan cau))*.