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

You may be able to get more results by adjusting your search query.

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