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