Perhaps you should try some spelling variations:
"serie ensayos graficos." » "serie ensayos biograficos.", "serie ensayos criticos.", "serie ensayos juridicos.", "serie ensayo graficos."
"series estudios historicos." » "serie estudios historicos.", "seis estudios historicos.", "tres estudios historicos.", "series estudios historico.", "series estudios historica.", "series estudios historias."
"serie estudio urbano." » "serie estudios urbano.", "serie estudios urbanos.", "serie espacio urbano.", "serie studia urbano.", "serie estado 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 estudio urbano.") or ((("serie ensayos graficos.") or ("series estudios historicos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudio urbano.") OR ((("serie ensayos graficos.") OR ("series estudios historicos.")))).
• Removing quotes may allow a broader search: (( serie estudio urbano. ) or ((( serie ensayos graficos. ) or ( series estudios historicos. )))).
• Adding a wildcard symbol may retrieve word variants: (("serie estudio urbano.") or ((("serie ensayos graficos.") or ("series estudios historicos."))))*.