How to configure solr for Advanced search module

Hello,
Is anyone know how to configure the solr adapter for advanced search module to give better results while querying ?

For example, if I’m searching for “directive” or “directiv” or “directives”, I want the same output. For the moment, if I’m looking for “directiv” I have no results.
I think I need to configure solr but I don’t know how.

Thanks !