Perhaps you should try some spelling variations:
"dos estudios hispanic." » "dos estudios hispanicos.", "dos estudios hispano.", "dos studies hispanic.", "los estudios hispanic."
"series estudios urbanos." » "serie estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos.", "serie estudioss urbanos.", "senales estudios urbanos."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbano.", "series espacio urbano."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("series estudios urbanos.") or ("series estudio urbano."))) or ("dos estudios hispanic."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbanos.") OR ("series estudio urbano."))) OR ("dos estudios hispanic.")).
• Removing quotes may allow a broader search: (((( series estudios urbanos. ) or ( series estudio urbano. ))) or ( dos estudios hispanic. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbanos.") or ("series estudio urbano."))) or ("dos estudios hispanic."))*.