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