Perhaps you should try some spelling variations:
"serie estudios peruanoss." » "serie estudios urbanos.", "serie estudios urbanoss.", "serie estudios americanoss.", "serie estudios ensayoss."
"series estudios peruanos." » "series estudios urbanos.", "series estudios americanos.", "series estudios ensayos.", "seis estudios peruanos.", "tres estudios peruanos.", "leyes estudios peruanos."
"dos estudios urbano." » "dos estudios urbanos.", "dos estudio urbano.", "dos estudios hispano.", "los estudios urbano."

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