Perhaps you should try some spelling variations:
"digitalia ebook collection: del editor." » "digitalia ebook collecting: del editor.", "digitalia ebook collectors: del editor.", "digitalia ecoin collections: del editor.", "digitalia ebook collection: del escritor.", "digitalia ebooks collection: del editor."
"digitalia book collection: ruiz editores." » "digitalia book collecting: ruiz editores.", "digitalia book collectors: ruiz editores.", "digitalia coin collections: ruiz editores.", "digitalia book collection: ril editores.", "digitalia book collection: ruiz editor.", "digitalia book collection: xxi editores."

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 ebook collection: del editor.") or ("digitalia book collection: ruiz editores."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digitalia ebook collection: del editor.") OR ("digitalia book collection: ruiz editores.")).
• Removing quotes may allow a broader search: (( digitalia ebook collection: del editor. ) or ( digitalia book collection: ruiz editores. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia ebook collection: del editor.") or ("digitalia book collection: ruiz editores."))*.