Perhaps you should try some spelling variations:
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"digitalia ebook collection: recinto universitario de zaragoza." » "digitalia ebook collection: recinto universitarios de zaragoza.", "digitalia ebook collection: recinto universitarias de zaragoza.", "digitalia ebook collection: recinto universitarios en zaragoza.", "digitalia ebook collecting: recinto universitario de zaragoza.", "digitalia ebook collectors: recinto universitario de zaragoza.", "digitalia ecoin collections: recinto universitario de zaragoza.", "digitalia ebook collection: reciente universitario de zaragoza."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("digitalia ebook collection: recinto universitario de zaragoza.") or ("digitalia book collection: extra universitaria de zaragoza."))) or ("digitalia ebooks collection: profesorado universitario de zaragoza."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("digitalia ebook collection: recinto universitario de zaragoza.") OR ("digitalia book collection: extra universitaria de zaragoza."))) OR ("digitalia ebooks collection: profesorado universitario de zaragoza.")).
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• Adding a wildcard symbol may retrieve word variants: (((("digitalia ebook collection: recinto universitario de zaragoza.") or ("digitalia book collection: extra universitaria de zaragoza."))) or ("digitalia ebooks collection: profesorado universitario de zaragoza."))*.