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