Perhaps you should try some spelling variations:
"series estudioss urbano." » "series estudios urbano.", "seis estudios urbano.", "serie estudio urbano.", "series estudios urbanos.", "series estudio urbano."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."
"dos estudios urbano." » "dos estudios urbanos.", "dos estudio urbano.", "dos estudios peruanos.", "los estudios urbano."

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