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