Perhaps you should try some spelling variations:
national » nationaler (Expand Search), nation (Expand Search), nationen (Expand Search)
nationala » nationalera (Expand Search), nationa (Expand Search), nationena (Expand Search), nationaler (Expand Search)
nationale » nationalere (Expand Search), natione (Expand Search), nationene (Expand Search)
nationalen » nationaleren (Expand Search), nationen (Expand Search), nationenen (Expand Search)
nationales » nationaleres (Expand Search), nationes (Expand Search), nationenes (Expand Search), nationaler (Expand Search), nationalist (Expand Search), rationalen (Expand Search)

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: "((national OR nationala) OR (nationale OR (nationalen OR nationales))) theatre of strasbourg~".
• Adding a wildcard symbol may retrieve word variants: ((national OR nationala) OR (nationale OR (nationalen OR nationales))) theatre of strasbourg*.