Perhaps you should try some spelling variations:
"seis estudios peruanos." » "seis estudios urbanos.", "seis estudios americanos.", "seis estudios ensayos.", "los estudios peruanos.", "dos estudios peruanos.", "dios estudios peruanos."
"series estudioss urbano." » "series estudios urbano.", "serie estudios urbano.", "serie estudio urbano.", "series estudios urbanos.", "series estudiosss urbano.", "serie estudioss urbano.", "serie estudiosss urbano."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios 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: (((("series estudioss urbano.") or ("series estudio urbano."))) or ("seis estudios peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudioss urbano.") OR ("series estudio urbano."))) OR ("seis estudios peruanos."))*.
• Removing quotes may allow a broader search: (((( series estudioss urbano. ) or ( series estudio urbano. ))) or ( seis estudios peruanos. ))*.