Perhaps you should try some spelling variations:
mathematika » mathematica, mathematical, mathematiker
mathematicala » mathematical, mathematicals, mathematicaland
mathematikums » mathematikbuch, mathematiker, mathematikern
mathematikers » mathematiker, mathematikern, mathematiklehrer

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 mathematicala) OR mathematik) OR (mathematikums OR mathematikers)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((mathematika OR mathematicala) or mathematik) or (mathematikums or mathematikers))".
• Adding a wildcard symbol may retrieve word variants: (((mathematika OR mathematicala) or mathematik) or (mathematikums or mathematikers))*.