Perhaps you should try some spelling variations:
mathematika » mathematica, mathematiker, mathematicae
mathematical » mathematics
mathematikern » mathematiker
mathematikers » mathematiker, mathematiklehrer, mathematiklernen

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((mathematika OR mathematical) OR mathematik) OR (mathematikern OR mathematikers)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((mathematika OR mathematical) or mathematik) or (mathematikern or mathematikers))".
• Adding a wildcard symbol may retrieve word variants: (((mathematika OR mathematical) or mathematik) or (mathematikern or mathematikers))*.