Perhaps you should try some spelling variations:
"tiep thi luan van dinh doanh" » "tiep thi luan van kinh doanh", "tiep thi luan van minh doanh", "tiep thi luan van chinh doanh", "tiep thi lan van dinh doanh", "tiep thi xuan van dinh doanh", "tiep thi loan van dinh doanh", "tiep thi luan van dich doanh", "tiep thi luan va dinh doanh", "tien thi luan van dinh doanh", "tieu thi luan van dinh doanh"
"trieu thi luan van dinh doanh" » "trieu thi luan van kinh doanh", "trieu thi luan van minh doanh", "trieu thi luan van chinh doanh", "trieu thi lan van dinh doanh", "trieu thi xuan van dinh doanh", "trieu thi loan van dinh doanh", "trieu thi luan van dich doanh", "trieu thi luan va dinh 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: (("tiep thi luan van dinh doanh") or ("trieu thi luan van dinh doanh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tiep thi luan van dinh doanh") OR ("trieu thi luan van dinh doanh")).
• Removing quotes may allow a broader search: (( tiep thi luan van dinh doanh ) or ( trieu thi luan van dinh doanh )).
• Adding a wildcard symbol may retrieve word variants: (("tiep thi luan van dinh doanh") or ("trieu thi luan van dinh doanh"))*.