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."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."
"series estudio urbanos." » "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos.", "serie estudio urbanos.", "senales estudio urbanos.", "teorias estudio urbanos."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie estudios urbano.") or ((("series estudios peruanoss.") or ("series estudio urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudios urbano.") OR ((("series estudios peruanoss.") OR ("series estudio urbanos."))))*.
• Removing quotes may allow a broader search: (( serie estudios urbano. ) or ((( series estudios peruanoss. ) or ( series estudio urbanos. ))))*.