Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh, hanh chinh
quan phong » luan phong, quang phuong, luan phuong
tuan phong » thuan phong, tran phong, luan phong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
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 tach - hanh trinh ((quan phong) OR (tuan phong)) cong dan ((than man) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trinh ((quan phong) OR (tuan phong)) cong dan ((than man) OR (thanh san)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh trinh ((quan phong) OR (tuan phong)) cong dan ((than man) or (thanh san))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trinh ((quan phong) OR (tuan phong)) cong dan ((than man) or (thanh san))*.