Perhaps you should try some spelling variations:
"serie d'estudis urbans." » "serie estudios urbanos.", "serie estudios urbano.", "serie estudios urbans.", "serie estudio urbans.", "serie estudos urbans."
"dos estudios hispana." » "dos estudios hispano.", "dos estudios hispanicos.", "dos estudios historia.", "los estudios hispana."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio urbano."

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: (((("serie d'estudis urbans.") or ("series estudio urbano."))) or ("dos estudios hispana."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie d'estudis urbans.") OR ("series estudio urbano."))) OR ("dos estudios hispana.")).
• Removing quotes may allow a broader search: (((( serie d'estudis urbans. ) or ( series estudio urbano. ))) or ( dos estudios hispana. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie d'estudis urbans.") or ("series estudio urbano."))) or ("dos estudios hispana."))*.