Perhaps you should try some spelling variations:
"digitalia _ collections: con radiacion." » "digitalia _ collections: con adicion.", "digitalia _ collections: con mediacion.", "digitalia _ collections: por radiacion."
"digitalia ebook collection: lom ediciones." » "digitalia ebooks collection: lom ediciones.", "digitalia book collection: lom ediciones.", "digitalia ebook collection: lom edicion."

You may be able to get more results by adjusting your search query.

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