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

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