Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan phong » luan phong, tuan phong, quang phuong
phong cong » phong chong, thong cong, chong cong
hoc thiet » hoc thieu, hoc hien, toc thieu
cong dan » cong san, cong tan, huong dan
than man » than ma, tran manh, than phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) OR (hoc thuyet)) tach - hanh trinh quan phong cong dan ((than man) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) tach - hanh trinh quan phong cong dan ((than man) OR (thanh san)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) tach - hanh trinh quan phong cong dan ((than man) or (thanh san))".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) tach - hanh trinh quan phong cong dan ((than man) or (thanh san))*.