Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudio urbano.", "series estudios peruanos.", "series estudios hispano."
"los estudios urbano." » "los estudio urbano.", "los estudios peruanos.", "los estudios hispano."
"seis estudios urbanos." » "seis estudio urbanos.", "seis estudios peruanoss.", "seis estudios hispanos.", "dos estudios urbanos.", "dios estudios urbanos.", "pons 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 ((("los estudios urbano.") or ("seis estudios urbanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudios urbano.") OR ((("los estudios urbano.") OR ("seis estudios urbanos."))))*.
• Removing quotes may allow a broader search: (( series estudios urbano. ) or ((( los estudios urbano. ) or ( seis estudios urbanos. ))))*.