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

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 estudios urbano."))) or ("tres estudios peruanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudioss urbano.") OR ("series estudios urbano."))) OR ("tres estudios peruanos.")).
• Removing quotes may allow a broader search: (((( series estudioss urbano. ) or ( series estudios urbano. ))) or ( tres estudios peruanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudioss urbano.") or ("series estudios urbano."))) or ("tres estudios peruanos."))*.