Perhaps you should try some spelling variations:
chon chinh » cho chinh, thon chinh, chinh chinh
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
nguong dan » huong dan
luan hoan » luan van
ho chinh » hoc chinh, cho chinh, hoa chinh
nong dan » cong dan, nong san, huong dan
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 chinh) or (chon chinh)) sach - hanh trinh luan hoan ((nong dan) OR (nguong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chinh) OR (chon chinh)) sach - hanh trinh luan hoan ((nong dan) OR (nguong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chinh) or (chon chinh)) sach - hanh trinh luan hoan ((nong dan) OR (nguong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chinh) or (chon chinh)) sach - hanh trinh luan hoan ((nong dan) OR (nguong dan)) toan cao*.