Not searching part of the Word

Hello

on my page
www.fgvz.ch

i have installed
Inline Ajax Search 6.x-3.9
jQuery Update 6.x-1.1
Search Lucene API 6.x-2.2

But Still i can't find out how to setup!
As example
searching for,is in German, Aubergine
I belive as soon i have more the 3 letters it shoul start to show a alternative.
Or if i search for "bergine" it should show up also Aubergine.

But it is not working like that.
Did i understoud something wrong?!

Thanks for feedback

Vincent