Perhaps you should try some spelling variations:
"series estudios hispanos." » "series estudios hispano.", "series estudios hispanicos.", "series estudios espanoles.", "seis estudios hispanos.", "tres estudios hispanos.", "sociales estudios hispanos."
"leyes estudios hispana." » "leyes estudios hispano.", "leyes estudios hispanicos.", "leyes estudios historia.", "los estudios hispana.", "seis estudios hispana.", "tres estudios hispana."
"serie estudios urbano." » "serie estudios urbanos.", "serie estudio urbano.", "serie estudios peruanos."

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 hispanos.") or ("serie estudios urbano."))) or ("leyes estudios hispana."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios hispanos.") OR ("serie estudios urbano."))) OR ("leyes estudios hispana."))*.
• Removing quotes may allow a broader search: (((( series estudios hispanos. ) or ( serie estudios urbano. ))) or ( leyes estudios hispana. ))*.