Perhaps you should try some spelling variations:
numerische mathematical » numerical mathematical, numerischen mathematik, american mathematical
international serious » international services, international religious, international settings
numerical mathematics » industrial mathematics, general mathematics

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: international serious of ((((numerical mathematics) OR (numerische mathematik))) OR (numerische mathematical)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "international serious of ((((numerical mathematics) OR (numerische mathematik))) or (numerische mathematical))".
• Adding a wildcard symbol may retrieve word variants: international serious of ((((numerical mathematics) OR (numerische mathematik))) or (numerische mathematical))*.