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

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: (((("series estudios urbanos.") OR ("serie estudios peruanos."))) OR ("serie estudioss urbano."))~.
• Removing quotes may allow a broader search: (((( series estudios urbanos. ) or ( serie estudios peruanos. ))) or ( serie estudioss urbano. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbanos.") or ("serie estudios peruanos."))) or ("serie estudioss urbano."))*.