Perhaps you should try some spelling variations:
"dos estudios hispanic." » "dos estudios hispanicos.", "dos estudios hispano.", "dos studies hispanic.", "los estudios hispanic."
"serie estudos urbans." » "serie estudios urbanos.", "serie estudios urbano.", "serie d'estudis urbans.", "serie estudios urbans.", "series estudios urbans.", "serie estado urbans."
"series espacio urbano." » "series spain urbano.", "versus espacio urbano.", "sociales espacio urbano.", "series espacio urbanismo."

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 estudos urbans.") OR ("series espacio urbano."))) OR ("dos estudios hispanic."))~.
• Removing quotes may allow a broader search: (((( serie estudos urbans. ) or ( series espacio urbano. ))) or ( dos estudios hispanic. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("serie estudos urbans.") or ("series espacio urbano."))) or ("dos estudios hispanic."))*.