Since we've been getting inconsistent results from the LMR search engine, I've taken to using Google search, and specifying the site.
In case you don't know how to do this, just go to Google and search for:
site:letsmakerobots.com <whatever you are looking for>
For example, if you want to find all references to Mr Basic, you type:
site:letsmakerobots.com "Mr Basic"