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