Perhaps you should try some spelling variations:
"series estudios peruanoss." » "series estudios peruanos.", "series estudios urbanos.", "serie estudios peruanoss.", "seis estudios peruanoss.", "tres estudios peruanoss."
"los estudios urbano." » "los estudios urbanos.", "los estudio urbano.", "los estudios peruanos."
"reales estudio urbanos." » "reales estudios urbanos.", "reales estudio urbano.", "reales estudios peruanos.", "senales estudio urbanos.", "redes estudio urbanos."

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