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

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

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