Perhaps you should try some spelling variations:
national » nationalen (Expand Search), nationales (Expand Search), nation (Expand Search)
nationala » nationalena (Expand Search), nationalesa (Expand Search), nationa (Expand Search), nationalen (Expand Search)
nationale » nationalene (Expand Search), nationalese (Expand Search), natione (Expand Search)
nationaler » nationalener (Expand Search), nationaleser (Expand Search), nationer (Expand Search), nationalen (Expand Search)
archiven » archivs (Expand Search), archivsn (Expand Search)
archive » archivs (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 nationala) OR (nationale OR nationaler)) (archiven OR (archive OR archiv)) of romania~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((national OR nationala) OR (nationale OR nationaler)) (archiven OR (archive OR archiv)) of romania".
• Adding a wildcard symbol may retrieve word variants: ((national OR nationala) OR (nationale OR nationaler)) (archiven OR (archive OR archiv)) of romania*.