Perhaps you should try some spelling variations:
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"digitalia ebook collection: prensas universitaria de zaragoza." » "digitalia ebook collection: prensas universitarias de zaragoza.", "digitalia ebook collection: crisis universitaria de zaragoza.", "digitalia ebook collection: promesa universitaria de zaragoza.", "digitalia ebooks collection: prensas universitaria de zaragoza.", "digitalia book collection: prensas universitaria de zaragoza."

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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: profesor universitario de zaragoza."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digitalia ebook collection: prensas universitaria de zaragoza.") OR ("digitalia ebook collection: profesor universitario de zaragoza.")).
• Removing quotes may allow a broader search: (( digitalia ebook collection: prensas universitaria de zaragoza. ) or ( digitalia ebook collection: profesor universitario de zaragoza. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia ebook collection: prensas universitaria de zaragoza.") or ("digitalia ebook collection: profesor universitario de zaragoza."))*.