Perhaps you should try some spelling variations:
derecho agraria » derecho amalia, derecho maria, derecho bancario
"Derecho agraria en alimentario." » "Derecho agraria en alimentacion.", "Derecho agraria eje alimentario.", "Derecho agraria uso alimentario."
"derecho agrario y alimentario." » "derecho agrario y alimentacion.", "derecho agraria y alimentario."

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: (("derecho agrario y alimentario.") or ("Derecho agraria en alimentario."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("derecho agrario y alimentario.") OR ("Derecho agraria en alimentario.")).
• Removing quotes may allow a broader search: (( derecho agrario y alimentario. ) or ( Derecho agraria en alimentario. )).
• Adding a wildcard symbol may retrieve word variants: (("derecho agrario y alimentario.") or ("Derecho agraria en alimentario."))*.