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