With over 5,200 posts, and over 40 pages, of information on the site, I noticed the default WP search was not finding the information very well (I use the site myself to lookup information I have posted about). Some information is now also contained in short code tables that were also excluded from standard WP search.
I tested a few alternative search plugins and decided to implement Relevanssi which is doing the job very well. You can test it by clicking on the search icon on the menu bar on the right side.