Perhaps you should try some spelling variations:
passiven » passive, passion
massively » massive
passivierender » aktivierender, passivieren, passivierenr, passivierungr
passivierende » passivieren, aktivierende, passivierung

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: ((passiven OR massively) OR (passivierender OR passivierende)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiven or massively) or (passivierender OR passivierende))".
• Adding a wildcard symbol may retrieve word variants: ((passiven or massively) or (passivierender OR passivierende))*.