Perhaps you should try some spelling variations:
"series d'estudis urbans." » "series estudios urbans.", "serie estudio urbans.", "serie estudos urbans.", "series estudios urbanos.", "series estudio urbano."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."
"seis estudios hispano." » "los estudios hispano.", "dos estudios hispano.", "dios estudios hispano.", "seis estudios hispana.", "seis 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: (((("series d'estudis urbans.") or ("serie estudios urbano."))) or ("seis estudios hispano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series d'estudis urbans.") OR ("serie estudios urbano."))) OR ("seis estudios hispano."))*.
• Removing quotes may allow a broader search: (((( series d'estudis urbans. ) or ( serie estudios urbano. ))) or ( seis estudios hispano. ))*.