Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
cua khong » hua khong, cua phuong, cua thuong
thanh van » thanh san, thanh toan, thanh phan
cong dan » cong san, cong tan, cong dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh trinh cua khong ((cong dan) or (huong dan)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh trinh cua khong ((cong dan) OR (huong dan)) thanh van.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh cua khong ((cong dan) or (huong dan)) thanh van*.