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