Perhaps you should try some spelling variations:
"digitalis las collections: con mediacion." » "digitalis law collections: con mediacion.", "digitalis _ collections: con mediacion.", "digitalis las colecciones: con mediacion.", "digitales la collections: con mediacion.", "digital las collections: con mediacion.", "digital la collections: con mediacion.", "digitalis las collections: co mediacion.", "digitalis las collections: como mediacion.", "digitalis las collections: con radiacion."
"digitalia ebook collection: lom ediciones." » "digitalia ebooks collection: lom ediciones.", "digitalia book collection: lom ediciones."

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