Perhaps you should try some spelling variations:
"dos estudios hispanos." » "dos estudios hispano.", "dos estudios hispanicos.", "dos estudios espanoles.", "los estudios hispanos."
"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."

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