Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh, hanh chinh
chau phong » hai phong, phap phong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua khong » hua khong, cua phuong, cua thuong
cong san » cong tac
san than » sang than, san thanh, ban 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 thiet tach - hanh trinh ((chau phong) or (cua khong)) cong san than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trinh ((chau phong) OR (cua khong)) cong san than man.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trinh ((chau phong) or (cua khong)) cong san than man*.