Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudios peruanos.", "series estudios hispano."
"dos estudios urbano." » "dos estudios urbanos.", "dos estudios peruanos.", "dos estudios hispano.", "los estudios urbano."
"seis estudio urbano." » "seis estudios urbanos.", "seis espacio urbano.", "seis estudios urbano.", "eees estudio urbano.", "seire estudios urbano."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("series estudios urbano.") or ((("dos estudios urbano.") or ("seis estudio urbano."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbano.") OR ((("dos estudios urbano.") OR ("seis estudio urbano.")))).
• Removing quotes may allow a broader search: (( series estudios urbano. ) or ((( dos estudios urbano. ) or ( seis estudio urbano. )))).
• Adding a wildcard symbol may retrieve word variants: (("series estudios urbano.") or ((("dos estudios urbano.") or ("seis estudio urbano."))))*.