Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
hanh tram » hanh tam, hanh trang, thanh tran
tram van » tran van, tam van, trang van
van hang » van khang, van hoang, van thang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - hanh tram van hang ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - hanh tram van hang ((cong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - hanh tram van hang ((cong dan) or (cong san)) toan cao*.