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

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

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