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