Perhaps you should try some spelling variations:
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"xxvii jornadas de coordinacion de defensores" » "xvii jornadas de coordinacion de defensores" (Expand Search), "xii jornadas de coordinacion de defensores" (Expand Search), "vii jornadas de coordinacion de defensores" (Expand Search), "xxvii jornadas de coordinacion los defensores" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("xxvii jornadas de coordinacion de defensores") OR ("xxvii jornadas de coordinacion del defensor"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"xxvii jornadas de coordinacion de defensores\") OR (\"xxvii jornadas de coordinacion del defensor\"))".
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• Adding a wildcard symbol may retrieve word variants: (("xxvii jornadas de coordinacion de defensores") OR ("xxvii jornadas de coordinacion del defensor"))*.