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

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 collection: ril editor.") OR ("digitalia book collection: del editor."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"digitalia book collection: ril editor.\") OR (\"digitalia book collection: del editor.\"))".
• Removing quotes may allow a broader search: (( digitalia book collection: ril editor. ) OR ( digitalia book collection: del editor. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia book collection: ril editor.") OR ("digitalia book collection: del editor."))*.