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 urbanos.", "series estudio urbano.", "serie estudioss urbano.", "seis estudioss urbano.", "tres estudioss urbano."
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios hispano."

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 urbano.") OR ("series estudios peruanos."))) or ("series estudioss urbano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbano.") OR ("series estudios peruanos."))) OR ("series estudioss urbano.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"series estudios urbano.\") OR (\"series estudios peruanos.\"))) or (\"series estudioss urbano.\"))".
• Removing quotes may allow a broader search: (((( series estudios urbano. ) OR ( series estudios peruanos. ))) or ( series estudioss urbano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbano.") OR ("series estudios peruanos."))) or ("series estudioss urbano."))*.