Perhaps you should try some spelling variations:
resisting » existing, resistant, assisting
resistiver » resistive, resister
restriktiver » restriktive, restriktiven, restrictive
resistor » resistors, resist, resisted

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: (( resisting OR (resistiver OR restriktiver) ) OR resistor ).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( resisting or (resistiver OR restriktiver) ) or resistor )".
• Adding a wildcard symbol may retrieve word variants: (( resisting or (resistiver OR restriktiver) ) or resistor )*.