I need better search results

Hi,

I am using responsive couponpress.
I am using the advanced search in the general settings.
I added a keyword search.

When I test it the following happens:

I fill in keyword = Lego.
I get a few listings with the keyword Lego in it. This is good.
Now I fill in keyword = Policestation Lego.
I get no results.
I would like to see the same results as I would get when I type in keyword = Lego. So sort of a partial search. Is this possible? What changes do I need to make?

Regards,

Astrid