Perhaps you should try some spelling variations:
"valores formativos de grado superior." » "valores normativos de grado superior.", "valores informativos de grado superior.", "valor formativo de grado superior.", "valores formativo en grado superior."
"valor educativo al gran superior." » "valores educativos al gran superior.", "labor educativa al gran superior.", "lo educativo al gran superior.", "valor educativo al grau superior.", "valor educativo al orden superior.", "valor educativo al loa superior.", "valor educativa al gran superior.", "valor educativo a gran superior.", "valor educativo el gran superior.", "valor educativo al grano superior."

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: (("valores formativos de grado superior.") or ("valor educativo al gran superior."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("valores formativos de grado superior.") OR ("valor educativo al gran superior.")).
• Removing quotes may allow a broader search: (( valores formativos de grado superior. ) or ( valor educativo al gran superior. )).
• Adding a wildcard symbol may retrieve word variants: (("valores formativos de grado superior.") or ("valor educativo al gran superior."))*.