Perhaps you should try some spelling variations:
"chien quoc kinh doanh luan van" » "chien luoc kinh doanh luan van", "chien cuoc kinh doanh luan van", "chuyen quoc kinh doanh luan van", "chien quoc kinh doanh nhan van", "chien nuoc kinh doanh luan van", "chien quoc vinh doanh luan van"
"chien quoc binh doanh luan van" » "chien luoc binh doanh luan van", "chien cuoc binh doanh luan van", "chuyen quoc binh doanh luan van", "chien quoc binh doanh nhan van", "chien quoc minh doanh luan van", "chien quoc chinh doanh luan van", "chien quoc minh danh luan van", "chien quoc thinh doanh luan van", "chien luoc kinh doanh luan van", "chien quan binh doanh luan van"

Try widening your search to All Fields.

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