Perhaps you should try some spelling variations:
"seis estudios peruanoss." » "seis estudios urbanos.", "seis estudios urbanoss.", "seis estudios americanoss.", "seis estudios ensayoss.", "los estudios peruanoss.", "dos estudios peruanoss.", "dios estudios peruanoss."
"series estudios peruanos." » "series estudios urbanos.", "series estudios americanos.", "series estudios ensayos.", "serie estudios peruanos.", "tres estudios peruanos.", "leyes estudios peruanos."
"series estudios urbano." » "serie estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios hispano."

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