Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
trinh doan » trinh toan, thinh doan, trinh dan
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thuyet) or (hoc hien)) tach - hanh trinh doan phuong cong dan than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thuyet) OR (hoc hien)) tach - hanh trinh doan phuong cong dan than man.
• Adding a wildcard symbol may retrieve word variants: ((hoc thuyet) or (hoc hien)) tach - hanh trinh doan phuong cong dan than man*.