Perhaps you should try some spelling variations:
"dos estudios peruanoss." » "dos estudios peruanos.", "dos estudios urbanos.", "los estudios peruanoss."
"serie estudio peruanos." » "serie estudios peruanos.", "serie estado peruano.", "serie estudios urbanos.", "series estudios peruanos.", "serie studia peruanos."
"series estudio urbano." » "series estudios urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbanos.", "series espacio urbano."

Try widening your search to All Fields.

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

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