Perhaps you should try some spelling variations:
rolf » role (Expand Search), roll (Expand Search), roof (Expand Search)
root » robot (Expand Search), room (Expand Search)
henne\" » hence\" (Expand Search), henna\" (Expand Search), henny\" (Expand Search)
henner\" » hencer\" (Expand Search), hennar\" (Expand Search), hennyr\" (Expand Search), wenner\" (Expand Search), jenner\" (Expand Search), benner\" (Expand Search)
hennes\" » hences\" (Expand Search), hennas\" (Expand Search), hennys\" (Expand Search), hannes\" (Expand Search), gennes\" (Expand Search), pennes\" (Expand Search)
hennas\" » henna\" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"\\"(rolf OR (proof OR root)) ((henne\\" OR henner\\") OR (hennes\\" OR hennas\\"))\"".
• Removing quotes may allow a broader search: (rolf OR (proof OR root)) ((henne OR henner ) OR (hennes OR hennas )).