Perhaps you should try some spelling variations:
"digitalia books collection: lom ediciones." » "digitalia ebook collection: lom ediciones.", "digitalia book collecting: lom ediciones.", "digitalia book collectors: lom ediciones.", "digitalia ebooks collection: lom ediciones.", "digitalia books collection: lom edicion."
"digitalia book collection: la educacion." » "digitalia ebook collection: la educacion.", "digitalia book collecting: la educacion.", "digitalia book collectors: la educacion."

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