Perhaps you should try some spelling variations:
"series estudioss urbano." » "series estudios urbano.", "serie estudios urbano.", "seis estudios urbano.", "series estudios urbanos.", "series estudiosss urbano.", "serie estudioss urbano.", "serie estudiosss urbano."
"tres estudios urbano." » "tres estudios urbanos.", "tres estudios peruanos.", "tres estudios hispano.", "otros estudios urbano.", "los estudios urbano.", "dos estudios urbano."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio 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: (("series estudioss urbano.") OR ((("tres estudios urbano.") OR ("series estudio urbano."))))~.
• Removing quotes may allow a broader search: (( series estudioss urbano. ) or ((( tres estudios urbano. ) or ( series estudio urbano. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("series estudioss urbano.") or ((("tres estudios urbano.") or ("series estudio urbano."))))*.