Perhaps you should try some spelling variations:
national » nationl (Expand Search), nationsl (Expand Search), nationalel (Expand Search)
nationa » nation (Expand Search), nations (Expand Search), nationale (Expand Search)
nationaler » nationler (Expand Search), nationsler (Expand Search), nationaleler (Expand Search)
nationalea » nationlea (Expand Search), nationslea (Expand Search), nationalelea (Expand Search)
nationalen » nationlen (Expand Search), nationslen (Expand Search), nationalelen (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 ((nationa OR nationaler) OR nationalea)) OR nationalen) university of kharkiv~".
• Adding a wildcard symbol may retrieve word variants: ((national OR ((nationa OR nationaler) OR nationalea)) OR nationalen) university of kharkiv*.