If you want to do Like searches and also search the module title, change the Stored Procedure "GetSearchResults" where it says:

AND (sw.Word = @Word)

to

AND (sw.Word like ‘%’ + @Word + ‘%’ OR m.ModuleTitle like ‘%’ + @Word + ‘%’)

There is also an 'Extended DNN search provider' which indexes the page names, titles, description and keywords. This can be found here.