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