Perhaps you should try some spelling variations:
"tres estudios peruanoss." » "tres estudios peruanos.", "tres estudios urbanos.", "otros estudios peruanoss.", "los estudios peruanoss.", "dos estudios peruanoss."
"series estudio urbanos." » "series estudios urbanos.", "series estudios urbano.", "series estudios peruanos.", "serie estudio urbanos.", "serie estudios urbanos.", "series estudios urbanoss.", "series espacio urbanos."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio urbano."

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

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