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

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

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