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 urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."
"dos estudios hispano." » "los estudios hispano.", "dos estudios hispana.", "dos estudios hispanic."

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

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