Perhaps you should try some spelling variations:
"dien thoai luan van kinh doanh" » "dien hoa luan van kinh doanh", "dien toan luan van kinh doanh", "dien thai luan van kinh doanh", "dien khoa luan van kinh doanh", "dien thoai luan va kinh doanh", "dien thoai luan van minh doanh", "dien thoai luan van dinh doanh"
"dien thi lan van kinh doanh" » "dien thi lan va kinh doanh", "dien thi lan van minh doanh", "dien thi lan van dinh doanh", "trien thi lan van kinh doanh", "dien tu lan van kinh doanh", "dinh thi lan van kinh doanh", "dien thi hanh van kinh doanh", "dien thi nang van kinh doanh", "dien thi lien van kinh doanh", "dien thi lang van kinh doanh", "dien thi tan van kinh doanh", "dien thi san van kinh doanh"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("dien thoai luan van kinh doanh") or ("dien thi lan van kinh doanh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dien thoai luan van kinh doanh") OR ("dien thi lan van kinh doanh")).
• Removing quotes may allow a broader search: (( dien thoai luan van kinh doanh ) or ( dien thi lan van kinh doanh )).
• Adding a wildcard symbol may retrieve word variants: (("dien thoai luan van kinh doanh") or ("dien thi lan van kinh doanh"))*.