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."
"pons estudios urbano." » "pons estudios urbanos.", "pons estudio urbano.", "pons estudios peruanos.", "los estudios urbano.", "dios estudios urbano.", "seis estudios urbano."
"dos estudios hispano." » "los estudios hispano.", "dos estudios hispana.", "dos estudios hispanic."

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