Perhaps you should try some spelling variations:
"digitalia ebooks collection: ril editor." » "digitalia book collecting: ril editor.", "digitalia ebooks collection: ril editores.", "digitalia ebooks collection: ruiz editor.", "digitalia ebooks collection: al editor.", "digitalia books collection: ril editor."
"digitalia ebook collection: del editor." » "digitalia ebook collection: del escritor.", "digitalia book collection: del 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 ebooks collection: ril editor.") or ("digitalia ebook collection: del editor."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digitalia ebooks collection: ril editor.") OR ("digitalia ebook collection: del editor.")).
• Removing quotes may allow a broader search: (( digitalia ebooks collection: ril editor. ) or ( digitalia ebook collection: del editor. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia ebooks collection: ril editor.") or ("digitalia ebook collection: del editor."))*.