Perhaps you should try some spelling variations:
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "serie estudioss urbanos.", "senales estudios urbanos."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbano.", "series espacio urbano."
"reales estudio urbano." » "reales estudios urbano.", "reales espacio urbano.", "senales estudio urbano.", "redes estudio 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: (((("series estudio urbano.") or ("series estudios urbanos."))) or ("reales estudio urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudio urbano.") OR ("series estudios urbanos."))) OR ("reales estudio urbano.")).
• Removing quotes may allow a broader search: (((( series estudio urbano. ) or ( series estudios urbanos. ))) or ( reales estudio urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudio urbano.") or ("series estudios urbanos."))) or ("reales estudio urbano."))*.