Perhaps you should try some spelling variations:
mathematika » mathematica, mathematical, mathematikum
mathematicae » mathematical, mathematica, mathematician
mathematicala » mathematical, mathematicals, mathematicaland
mathematikers » mathematikern, mathematiklernen
mathematiklehrer » mathematikern

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