Perhaps you should try some spelling variations:
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "series estudio urbanos.", "series estudios peruanoss.", "series estudios hispanos."
"dos estudios urbano." » "dos estudio urbano.", "dos estudios peruanos.", "dos estudios hispano.", "los estudios urbano."
"reales estudio urbanos." » "reales estudio urbano.", "reales estudios peruanos.", "reales estudios urbanos.", "senales estudio urbanos.", "redes estudio urbanos."

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