Best WordPress Search Plugin - Expand Search Functions with Swiftype or Relevanssi
http://wplightbulb.com/course
The default wordpress search is very bad for sure. These are two free plugin which stands out. With these plugins you can make the searching experience way better.
You can customize the search engine and the results. Also with swiftype you can easily drag and drop the order of results for particular search term.
Any questions? Ask below.