Perhaps you should try some spelling variations:
"digitalia book collection: con variaciones." » "digitalia book collection: las variaciones.", "digitalia book collection: y variaciones.", "digitalia book collection: de variaciones.", "digitalia book collecting: con variaciones.", "digitalia book collectors: con variaciones.", "digitalia coin collections: con variaciones."
"digitalia ebook collection: lom edicion." » "digitalia ebook collecting: lom edicion.", "digitalia ebook collectors: lom edicion.", "digitalia ecoin collections: lom edicion.", "digitalia ebook collection: lom ediciones.", "digitalia ebook collection: la edicion.", "digitalia ebook collection: con edicion.", "digitalia ebooks collection: lom edicion."

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