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

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