Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
hanh tran » hanh trang, thanh tran, hanh tram
van khang » van khanh, van thanh, van quang
hoc tien » hoc tieng, hoc hien, hoc vien
tran van » luan 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 tran van khang ((cong dan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh tran van khang ((cong dan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh tran van khang ((cong dan) or (cong san)) toan cao*.