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 estudioss urbano." » "serie estudios urbano.", "serie estudios urbanos.", "serie estudio urbano.", "series estudios urbano."
"series estudio urbanos." » "series estudios urbanos.", "series estudio urbano.", "series estudios urbano.", "serie estudio urbanos.", "serie estudios urbanos."

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