Perhaps you should try some spelling variations:
passiv » massiv, passiven
passive » massive, passivene
passiverer » massiverer, passivenerer, passiverwerb, passivieren, passieren, passivener, passierter
passivelyer » massivelyer, passivenelyer, passiverwerb, passivityer, passivener
passiver » massiver, passivener, passiven, passiert
passively » massively, passivenely, passivity, passiven

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