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