Perhaps you should try some spelling variations:
"grand prix national des Lettres" » "grand prix national de Lettres", "grand prix national _ Lettres", "grand prix national sur Lettres", "grande prix national des Lettres", "gran prix national des Lettres", "grant prix national des Lettres", "grand prim national des Lettres"
"grand prix national defense Lettres" » "grande prix national defense Lettres", "gran prix national defense Lettres", "grant prix national defense Lettres", "grand prim national defense Lettres", "grand prix national defensa Lettres"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"grand prix national des Lettres\") OR (\"grand prix national defense Lettres\"))~".
• Removing quotes may allow a broader search: (( grand prix national des Lettres ) OR ( grand prix national defense Lettres ))~.
• Adding a wildcard symbol may retrieve word variants: (("grand prix national des Lettres") OR ("grand prix national defense Lettres"))*.