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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("series estudio urbano.") OR ((("reales estudios hispano.") OR ("rurales estudios hispano."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"series estudio urbano.\") or (((\"reales estudios hispano.\") OR (\"rurales estudios hispano.\"))))~".
• Removing quotes may allow a broader search: (( series estudio urbano. ) or ((( reales estudios hispano. ) OR ( rurales estudios hispano. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("series estudio urbano.") or ((("reales estudios hispano.") OR ("rurales estudios hispano."))))*.