Perhaps you should try some spelling variations:
"su thi luan van kinh doanh ha noi" » "su thi lan van kinh doanh ha noi", "su thi xuan van kinh doanh ha noi", "su thi loan van kinh doanh ha noi", "su thi luan va kinh doanh ha noi", "su thi luan van minh doanh ha noi", "su thi luan van dinh doanh ha noi", "su thi luan van kinh doanh khoa noi", "su thi luan van kinh doanh nhan noi", "su thi luan van kinh doanh hoan noi"
"su thi luan van kinh doanh va noi" » "su thi lan van kinh doanh va noi", "su thi xuan van kinh doanh va noi", "su thi loan van kinh doanh va noi", "su thi luan va kinh doanh va noi", "su thi luan van minh doanh va noi", "su thi luan van dinh doanh va noi", "su thi luan van kinh doan va noi", "su thi luan van kinh doanh tai noi", "su thi luan van kinh doanh cua noi", "su thi luan van kinh doanh van noi", "su thi luan van kinh doanh va ngoi", "su thi luan van kinh doanh va nuoi"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("su thi luan van kinh doanh ha noi") OR ("su thi luan van kinh doanh va noi"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"su thi luan van kinh doanh ha noi\") OR (\"su thi luan van kinh doanh va noi\"))".
• Removing quotes may allow a broader search: (( su thi luan van kinh doanh ha noi ) OR ( su thi luan van kinh doanh va noi )).
• Adding a wildcard symbol may retrieve word variants: (("su thi luan van kinh doanh ha noi") OR ("su thi luan van kinh doanh va noi"))*.