Perhaps you should try some spelling variations:
"digitalia ebooks collection: ruiz aitor." » "digitalia ebook collection: ruiz aitor.", "digitalia ebooks collection: ruiz victor.", "digitalia ebooks collection: ruiz anton.", "digitalia ebooks collection: ruiz mitos."
"digitalia book collecting: ruiz editor." » "digitalia ebook collection: ruiz editor.", "digitalia book collectors: ruiz editor.", "digitalia ebook collecting: ruiz editor."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("digitalia book collecting: ruiz editor.") or ("digitalia ebooks collection: ruiz aitor."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digitalia book collecting: ruiz editor.") OR ("digitalia ebooks collection: ruiz aitor.")).
• Removing quotes may allow a broader search: (( digitalia book collecting: ruiz editor. ) or ( digitalia ebooks collection: ruiz aitor. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia book collecting: ruiz editor.") or ("digitalia ebooks collection: ruiz aitor."))*.