Perhaps you should try some spelling variations:
"series estudios hispano." » "serie estudios hispano.", "seis estudios hispano.", "leyes estudios hispano.", "series estudios hispana.", "series estudios hispanic."
"serie estudio urbano." » "serie estudios urbano.", "serie espacio urbano.", "serie studia urbano.", "serie estado urbano."
"tres estudios urbanos." » "otros estudios urbanos.", "los estudios urbanos.", "dos 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 ("serie estudio urbano."))) or ("series estudios hispano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tres estudios urbanos.") OR ("serie estudio urbano."))) OR ("series estudios hispano.")).
• Removing quotes may allow a broader search: (((( tres estudios urbanos. ) or ( serie estudio urbano. ))) or ( series estudios hispano. )).
• Adding a wildcard symbol may retrieve word variants: (((("tres estudios urbanos.") or ("serie estudio urbano."))) or ("series estudios hispano."))*.