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."
"series estudios urbano." » "serie estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudios peruanos.", "series estudios hispano.", "serie estudioss urbano.", "senales estudios urbano."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbanos.", "series espacio urbano."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("seis estudios peruanoss.") or ("series estudio urbano."))) or ("series estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("seis estudios peruanoss.") OR ("series estudio urbano."))) OR ("series estudios urbano."))*.
• Removing quotes may allow a broader search: (((( seis estudios peruanoss. ) or ( series estudio urbano. ))) or ( series estudios urbano. ))*.