Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
trang van » tran van, trang va, trong van
hoc tien » hoc tieng, hoc hien, hoc vien
tram van » tran van, tam van, tranh van
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 tien manh - hanh ((tram van) OR (trang van)) khanh ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh ((tram van) OR (trang van)) khanh ((cong dan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - hanh ((tram van) OR (trang van)) khanh ((cong dan) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh ((tram van) OR (trang van)) khanh ((cong dan) or (cong san)) toan cao*.