Perhaps you should try some spelling variations:
"dos estudios americanos." » "dos estudios latinoamericanos.", "los estudios americanos."
"serie estudios hispanos." » "serie estudios hispano.", "serie estudios hispanicos.", "serie estudios espanoles."
"series estudios urbano." » "seis estudios urbano.", "tres estudios urbano.", "leyes estudios urbano.", "series estudios urbanos.", "series estudio urbano.", "series estudios peruanos."

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

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