Perhaps you should try some spelling variations:
experimentiert » experimentieren, experimentierens, experimenting
experimentierene » experimentierende, experimentieren, experimentierens
experimentierenden » experimentierfelder, experimentieren, experimentierens

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: ( experimentiert OR (experimentierene OR experimentierenden) ).
• Adding a wildcard symbol may retrieve word variants: ( experimentiert or (experimentierene or experimentierenden) )*.