Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
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
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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 than) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh tran van khang cong ((dan than) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh tran van khang cong ((dan than) or (van toan)) cao*.