Perhaps you should try some spelling variations:
"digitalia book collectors: como mediador." » "digitalia book collecting: como mediador.", "digitalia ebook collection: como mediador.", "digitalia ebook collectors: como mediador.", "digitalia book collectors: como indicador.", "digitalia book collectors: como mediacion.", "digitalia book collectors: como medio."
"digitalia book collection: con edicion." » "digitalia ebook collection: con edicion.", "digitalia book collecting: con edicion.", "digitalia coin collections: con edicion.", "digitalia book collection: con adicion.", "digitalia book collection: canon edicion.", "digitalia book collection: con mediacion."

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