Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationaler (Expand Search)
nationalese » nationaleese (Expand Search), nationalaese (Expand Search), nationalerese (Expand Search), nationales (Expand Search), nationale (Expand Search), nationaler (Expand Search)
nationalere » nationaleere (Expand Search), nationalaere (Expand Search), nationalerere (Expand Search), nationaler (Expand Search), nationale (Expand Search), nationales (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 nationalese) OR (nationalere OR nationalen)) connaissance front~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((national OR nationalese) OR (nationalere OR nationalen)) connaissance front".
• Adding a wildcard symbol may retrieve word variants: ((national OR nationalese) OR (nationalere OR nationalen)) connaissance front*.