Perhaps you should try some spelling variations:
"series estudios urbanos." » "series estudio urbanos.", "series estudios peruanoss.", "series d'estudis urbanss.", "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."
"series estudios urbano." » "series estudio urbano.", "series estudios peruanos.", "series d'estudis urbans.", "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano."
"seire estudios hispano." » "serie estudios hispano.", "seis estudios hispano.", "sobre estudios hispano."

You may be able to get more results by adjusting your search query.

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