Perhaps you should try some spelling variations:
"rurales estudios hispano." » "reales estudios hispano.", "locales estudios hispano.", "morales estudio hispano."
"series estudio urbano." » "series estudios urbano.", "serie estudio urbano.", "serie estudios urbano.", "series estudios urbanos.", "series espacio urbano."
"leyes estudios hispano." » "series estudios hispano.", "los estudios hispano.", "seis estudios hispano."

Try widening your search to All Fields.

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

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