Perhaps you should try some spelling variations:
mathematika » mathematica, mathematical, mathematicae
mathematicala » mathematical, mathematicals, mathematically
mathematicaland » mathematicalnd, mathematicalsnd, mathematicallynd, mathematicsand, mathematical, mathematicians
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 (mathematicala OR mathematicaland)) OR mathematik) OR (mathematikers OR (mathematiklehrer OR mathematiker))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((mathematika or (mathematicala OR mathematicaland)) or mathematik) or (mathematikers or (mathematiklehrer or mathematiker)))".
• Adding a wildcard symbol may retrieve word variants: (((mathematika or (mathematicala OR mathematicaland)) or mathematik) or (mathematikers or (mathematiklehrer or mathematiker)))*.