Perhaps you should try some spelling variations:
"dien dong minh tranh luan van" » "dien dong minh trang luan van", "dien dong minh thanh luan van", "dien dong canh tranh luan van", "dien dong minh trinh luan van", "dien dong minh trinh luat van", "dien dong minh doanh luan van", "dien cong minh tranh luan van", "dien xuong minh tranh luan van", "khien dong minh tranh luan van", "dien duong minh tranh luan van", "dien dong kinh tranh luan van", "dien dong ninh tranh luan van"
"dien dan minh tranh luan van" » "dien dan minh trang luan van", "dien dan minh thanh luan van", "dien dan canh tranh luan van", "dien dan minh trinh luan van", "dien dan minh trinh luat van", "dien dan minh doanh luan van", "hien dai minh tranh luan van", "vien dai minh tranh luan van", "gian dan minh tranh luan van", "dien doan minh tranh luan van", "dien dang minh tranh luan van", "dien van minh tranh luan van"

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