Perhaps you should try some spelling variations:
passiv » massiv
passiven » massiven, passion
passive » massive
passiverer » massiverer, passiverwerb, passivieren, passieren, passivelyer, passierter
passivenelyer » massivenelyer, passionelyer
passiver » massiver, passively, passiert

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: (((passiv OR passiven) OR passive) OR ((passiverer OR passivenelyer) OR passiver)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiven) or passive) or ((passiverer or passivenelyer) or passiver))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiven) or passive) or ((passiverer or passivenelyer) or passiver))*.