Perhaps you should try some spelling variations:
"serie estudios hispanos." » "serie estudios hispano.", "serie estudios hispanicos.", "serie estudios espanoles."
"series estudios etnicos." » "series estudios criticos.", "series estudios biblicos.", "seis estudios etnicos.", "tres estudios etnicos.", "leyes estudios etnicos."
"serie studia urbanos." » "serie estudios urbanos.", "serie 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: (((("serie studia urbanos.") or ("serie estudios hispanos."))) or ("series estudios etnicos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie studia urbanos.") OR ("serie estudios hispanos."))) OR ("series estudios etnicos.")).
• Removing quotes may allow a broader search: (((( serie studia urbanos. ) or ( serie estudios hispanos. ))) or ( series estudios etnicos. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie studia urbanos.") or ("serie estudios hispanos."))) or ("series estudios etnicos."))*.