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