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."
"dos estudios urbano." » "dos estudios urbanos.", "dos estudio urbano.", "dos estudios peruanos.", "los estudios urbano."
"seis estudio urbanos." » "seis estudios urbanos.", "seis estudio urbano.", "seis estudios peruanos.", "eees estudio urbanos.", "seire estudios urbanos."

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 urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbano.") OR ((("dos estudios urbano.") OR ("seis estudio urbanos."))))*.
• Removing quotes may allow a broader search: (( series estudios urbano. ) or ((( dos estudios urbano. ) or ( seis estudio urbanos. ))))*.