Add an advanced search form to bbPress search page with filters and search results ordering controls. On the admin side, you can control which user roles (or visitors) can use filters, and hide the filters you don’t want to use.
The Plugin adds the following filters:
Also, plugin can replace the default search form to include the link to the advanced form. The plugin supports use of the templates’ replacement package plugin GD Quantum Theme Pro for bbPress.
Plugin uses templates with filters and actions, and all templates can be overridden through theme, just like default bbPress templates can.
The Pro version contains many more great features:
And much, much more
More information about GD Power Search Pro