Perhaps you should try some spelling variations:
"los estudios americanos." » "los estudios latinoamericanos."
"series estudios espanol." » "series estudios espanoles.", "series estudios hispano.", "series estudios lesbianos.", "serie estudios espanol.", "seis estudios espanol.", "leyes estudios espanol."
"tres estudios urbanos." » "otros estudios urbanos.", "dos estudios urbanos.", "dios estudios urbanos."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("tres estudios urbanos.") or ("los estudios americanos."))) or ("series estudios espanol."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tres estudios urbanos.") OR ("los estudios americanos."))) OR ("series estudios espanol.")).
• Removing quotes may allow a broader search: (((( tres estudios urbanos. ) or ( los estudios americanos. ))) or ( series estudios espanol. )).
• Adding a wildcard symbol may retrieve word variants: (((("tres estudios urbanos.") or ("los estudios americanos."))) or ("series estudios espanol."))*.