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