Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationaler (Expand Search)
nationalaen » nationaleaen (Expand Search), nationalaaen (Expand Search), nationaleraen (Expand Search), nationale (Expand Search), nationala (Expand Search), nationaler (Expand Search)
nationalaaen » nationaleaaen (Expand Search), nationalaaaen (Expand Search), nationaleraaen (Expand Search), nationalitaten (Expand Search), nationale (Expand Search), nationala (Expand Search)
nationalesen » nationaleesen (Expand Search), nationalaesen (Expand Search), nationaleresen (Expand Search), nationales (Expand Search), nationale (Expand Search), nationaler (Expand Search)
nationalen » nationaleen (Expand Search), nationalaen (Expand Search), nationaleren (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 (nationalaen OR (nationalaaen OR (nationalesen OR nationalen)))) connaissance front~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(national OR (nationalaen OR (nationalaaen OR (nationalesen OR nationalen)))) connaissance front*".