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