Perhaps you should try some spelling variations:
"digitalia book collectors: con radiacion." » "digitalia book collecting: con radiacion.", "digitalia book collectors: con adicion.", "digitalia book collectors: con mediacion.", "digitalia book collectors: por radiacion."
"digitalia ebook collection: como mediador." » "digitalia ebook collection: como indicador.", "digitalia ebook collection: como mediacion.", "digitalia ebook collection: como medio.", "digitalia ebooks collection: como mediador."

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