Perhaps you should try some spelling variations:
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• Performing a fuzzy search may retrieve terms with similar spellings: (("digitalia ebook collection: prensas universitaria de zaragoza.") or ("digitalia ebook collection: profesora universitaria de zaragoza."))~.
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• Adding a wildcard symbol may retrieve word variants: (("digitalia ebook collection: prensas universitaria de zaragoza.") or ("digitalia ebook collection: profesora universitaria de zaragoza."))*.