Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationalen (Expand Search)
nationales » nationalees (Expand Search), nationalaes (Expand Search), nationalenes (Expand Search), nationale (Expand Search), nationalen (Expand Search), nationalist (Expand Search)
nationaler » nationaleer (Expand Search), nationalaer (Expand Search), nationalener (Expand Search), nationale (Expand Search), nationalen (Expand Search), nationala (Expand Search)
archiven » archiv (Expand Search)
archivs » archiv (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 (nationales OR nationaler)) (archiven OR archivs) of romania~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(national OR (nationales OR nationaler)) (archiven OR archivs) of romania".
• Adding a wildcard symbol may retrieve word variants: (national OR (nationales OR nationaler)) (archiven OR archivs) of romania*.