[Koha] Searching

Hello, I have another question. When I search in my koha opac let's say "algo" there's no result but when I typed in "algorithms" there's some result. So that means I need to typed in the whole words I need to search in order to have results. Is it because I'm using nozebra? How do you turn on and configure zebra anyway? I'm using koha 3. Thanks