Perhaps you should try some spelling variations:
"valor educativo y grado superior." » "valores educativos y grado superior.", "labor educativa y grado superior.", "lo educativo y grado superior.", "valor educativo de grado superior.", "valor educativo en grado superior.", "valor educativos de grado superior.", "valor educativo el grado superior.", "valor educativo y granos superior."
"valores normativos de grado superior." » "valores formativos de grado superior.", "valores normativo de grado superior.", "valores informativos de grado superior."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("valores normativos de grado superior.") or ("valor educativo y grado superior."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("valores normativos de grado superior.") OR ("valor educativo y grado superior."))*.
• Removing quotes may allow a broader search: (( valores normativos de grado superior. ) or ( valor educativo y grado superior. ))*.