Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
ho chiet » ho chieu, ho thiet, hoc thiet
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
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 van ((nong dan) OR (cong dan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh trinh luan van ((nong dan) OR (cong dan)) toan cau*".