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