Perhaps you should try some spelling variations:
"seis estudios peruanoss." » "seis estudios peruanos.", "seis estudios urbanos.", "los estudios peruanoss.", "dos estudios peruanoss.", "dios estudios peruanoss."
"seis estudios urbano." » "seis estudios urbanos.", "seis estudio urbano.", "seis estudios peruanos.", "los estudios urbano.", "dos estudios urbano.", "dios estudios urbano."
"series espacio urbano." » "series spain urbano.", "versus espacio urbano.", "sociales espacio urbano.", "series espacio urbanismo."

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