Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationaler (Expand Search), nationales (Expand Search)
nationalae » nationaleae (Expand Search), nationalerae (Expand Search), nationalesae (Expand Search), nationale (Expand Search), nationaler (Expand Search), nationales (Expand Search), nationalee (Expand Search), nationalere (Expand Search)
nationala » nationalea (Expand Search), nationalera (Expand Search), nationalesa (Expand Search), nationale (Expand Search), nationaler (Expand Search)
nationalen » nationaleen (Expand Search), nationaleren (Expand Search), nationalesen (Expand Search), nationale (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (national OR (nationalae OR (nationala OR nationalen))) connaissance front~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(national OR (nationalae OR (nationala OR nationalen))) connaissance front".
• Adding a wildcard symbol may retrieve word variants: (national OR (nationalae OR (nationala OR nationalen))) connaissance front*.