Perhaps you should try some spelling variations:
"series d'estudis urbans." » "series estudios urbans.", "serie estudios urbans.", "serie estudio urbans.", "series estudios urbano."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series espacio urbano."
"redes estudios urbanos." » "redes estudio urbanos.", "reales estudios urbanos.", "leyes 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: (((("series estudio urbano.") or ("series d'estudis urbans."))) or ("redes estudios urbanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudio urbano.") OR ("series d'estudis urbans."))) OR ("redes estudios urbanos.")).
• Removing quotes may allow a broader search: (((( series estudio urbano. ) or ( series d'estudis urbans. ))) or ( redes estudios urbanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudio urbano.") or ("series d'estudis urbans."))) or ("redes estudios urbanos."))*.