Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."
"serie estudio urbans." » "serie estudio urbano.", "serie estudios urbanos.", "serie d'estudis urbans.", "serie estudios urbans.", "serie studia urbans.", "serie estado urbans."
"dos estudios hispano." » "los estudios hispano.", "dos estudios hispana.", "dos estudios hispanic."

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: (((("serie estudio urbans.") OR ("series estudios urbano."))) OR ("dos estudios hispano."))~.
• Removing quotes may allow a broader search: (((( serie estudio urbans. ) or ( series estudios urbano. ))) or ( dos estudios hispano. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie estudio urbans.") or ("series estudios urbano."))) or ("dos estudios hispano."))*.