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