Perhaps you should try some spelling variations:
"dios estudios americanos." » "dios estudios latinoamericanos.", "dos estudios americanos.", "los estudios americanos.", "otros estudios americanos."
"series estudios hispano." » "serie estudios hispano.", "seis estudios hispano.", "tres estudios hispano."
"serie estudio urbano." » "serie estudios urbano.", "serie estudios urbanos.", "serie espacio urbano.", "serie studia urbano.", "serie estado urbano."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("serie estudio urbano.") or ((("series estudios hispano.") or ("dios estudios americanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("serie estudio urbano.") OR ((("series estudios hispano.") OR ("dios estudios americanos."))))*.
• Removing quotes may allow a broader search: (( serie estudio urbano. ) or ((( series estudios hispano. ) or ( dios estudios americanos. ))))*.