Perhaps you should try some spelling variations:
"series estudios peruanos." » "series estudios urbanos.", "series estudios americanos.", "series estudios ensayos.", "serie estudios peruanos.", "seis estudios peruanos.", "tres estudios peruanos."
"seis estudioss urbano." » "seis estudios urbanos.", "seis estudio urbano.", "seis estudios urbano.", "mis estudios urbano.", "seire estudios urbano."
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios hispano."

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

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