Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tran » hanh trang, thanh tran, hanh tram
van khang » van khanh, van thanh, van quang
hoc hieu » hoc thieu, hoc hien, doc hieu
tran van » luan van
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 hieu manh - hanh tran van khang cong ((xuan toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh tran van khang cong ((xuan toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh tran van khang cong ((xuan toan) or (van toan)) cao*.