Answer for Is there a problem with the search function?

Hello,
the website I’m talking about: http://m-brehm.de.
When you get to the 404 page with: http://m-brehm.de/kontakt/ you find a search form.
Although there is a part with Kontakt (contact details on front page), it’s impossible to find it and to get there by searching for it.
Hope my English is well enough 😉
Thanks and kind regards!