Perhaps you should try some spelling variations:
"seis estudios peruanoss." » "seis estudios peruanos.", "seis estudios urbanos.", "los estudios peruanoss.", "dos estudios peruanoss.", "dios estudios peruanoss."
"serie estudio urbanos." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos.", "serie studia urbanos.", "serie estado urbanos."
"series estudios urbano." » "serie estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series 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: (((("seis estudios peruanoss.") or ("serie estudio urbanos."))) or ("series estudios urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("seis estudios peruanoss.") OR ("serie estudio urbanos."))) OR ("series estudios urbano."))*.
• Removing quotes may allow a broader search: (((( seis estudios peruanoss. ) or ( serie estudio urbanos. ))) or ( series estudios urbano. ))*.