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

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