Perhaps you should try some spelling variations:
"serie d'estudis urbans." » "serie estudio urbano.", "serie estudios urbano.", "serie estudios urbans.", "serie estudio urbans.", "serie estudos urbans."
"series estudios hispano." » "serie estudios hispano.", "tres estudios hispano.", "leyes estudios hispano.", "series estudios hispana.", "series estudios hispanic."
"seis estudios urbanos." » "los estudios urbanos.", "dos estudios urbanos.", "dios estudios urbanos."

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

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