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