Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh luan » trinh luat, trinh quan, trinh han
ho chiet » ho chieu, ho thiet, hoc thiet
tinh cua » trinh cua, sinh cua, tinh chat
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: ho chiet tach - hanh ((trinh luan) or (tinh cua)) nhung ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((trinh luan) OR (tinh cua)) nhung ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh ((trinh luan) or (tinh cua)) nhung ((cong dan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((trinh luan) or (tinh cua)) nhung ((cong dan) OR (cong san)) toan cau*.