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