Perhaps you should try some spelling variations:
"vien quan ninh tranh luan van" » "vien quan ninh thanh luan van", "vien quan canh tranh luan van", "vien quan dinh thanh luan van", "vien quan ninh trinh luan van", "vien quan ninh trinh luat van", "vien quan ninh doanh luan van", "lien quan ninh tranh luan van", "tin quan ninh tranh luan van", "vien quang ninh tranh luan van", "vien quan binh tranh luan van", "vien quan tinh tranh luan van"
"van quan ninh tranh luan van" » "van quan ninh thanh luan van", "van quan canh tranh luan van", "van quan dinh thanh luan van", "van quan ninh trinh luan van", "van quan ninh trinh luat van", "van quan ninh doanh luan van", "van quang ninh tranh luan van", "van quan binh tranh luan van", "van quan tinh tranh luan van", "van ban ninh tranh luan van"

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