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

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

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