Perhaps you should try some spelling variations:
"series estudios peruanos." » "series estudios americanos.", "series estudios ensayos.", "series estudios cervantinos.", "seis estudios peruanos.", "tres estudios peruanos.", "leyes estudios peruanos."
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudio urbano.", "series estudios hispano.", "series d'estudis urbans."
"serie estudios urbanos." » "serie estudio urbanos.", "serie estudios hispanos.", "serie d'estudis urbanss."

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