Perhaps you should try some spelling variations:
"series estudios hispanicos." » "series estudios historicos.", "series estudios hispano.", "series estudios islamicos.", "serie estudios hispanicos.", "seis estudios hispanicos.", "tres estudios hispanicos."
"serie ensayos graficos." » "serie ensayos biograficos.", "serie ensayos criticos.", "serie ensayos juridicos.", "serie ensayo graficos."
"serie desafio urbano." » "serie desafio cubano.", "serie espacio urbano."

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: (("serie desafio urbano.") or ((("serie ensayos graficos.") or ("series estudios hispanicos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie desafio urbano.") OR ((("serie ensayos graficos.") OR ("series estudios hispanicos.")))).
• Removing quotes may allow a broader search: (( serie desafio urbano. ) or ((( serie ensayos graficos. ) or ( series estudios hispanicos. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie desafio urbano.") or ((("serie ensayos graficos.") or ("series estudios hispanicos."))))*.