Perhaps you should try some spelling variations:
"serie estudioss peruanos." » "serie estudios peruanos.", "serie estudio peruanos.", "serie estudos peruanos."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "serie estudioss urbanos.", "senales estudios urbanos."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbano.", "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: (((("series estudios urbanos.") or ("serie estudioss peruanos."))) or ("series estudio urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbanos.") OR ("serie estudioss peruanos."))) OR ("series estudio urbano.")).
• Removing quotes may allow a broader search: (((( series estudios urbanos. ) or ( serie estudioss peruanos. ))) or ( series estudio urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbanos.") or ("serie estudioss peruanos."))) or ("series estudio urbano."))*.