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

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 peruanoss.") or ("serie estudios urbano."))) or ("serie estudioss urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios peruanoss.") OR ("serie estudios urbano."))) OR ("serie estudioss urbano.")).
• Removing quotes may allow a broader search: (((( series estudios peruanoss. ) or ( serie estudios urbano. ))) or ( serie estudioss urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios peruanoss.") or ("serie estudios urbano."))) or ("serie estudioss urbano."))*.