Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationalen (Expand Search)
nationalaena » nationaleaena (Expand Search), nationalaaena (Expand Search), nationalenaena (Expand Search), nationalen (Expand Search), nationale (Expand Search), nationala (Expand Search)
nationalaes » nationaleaes (Expand Search), nationalaaes (Expand Search), nationalenaes (Expand Search), nationales (Expand Search), nationale (Expand Search), nationalen (Expand Search)
nationaler » nationaleer (Expand Search), nationalaer (Expand Search), nationalener (Expand Search), nationale (Expand Search), nationalen (Expand Search), nationala (Expand Search)
rationalen » nationalen (Expand Search), nationale (Expand Search), nationales (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 (nationalaena OR (rationalen OR nationalaes))) OR nationaler) universitat of kharkiv~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((national OR (nationalaena OR (rationalen OR nationalaes))) OR nationaler) universitat of kharkiv".
• Adding a wildcard symbol may retrieve word variants: ((national OR (nationalaena OR (rationalen OR nationalaes))) OR nationaler) universitat of kharkiv*.