I’ve heard folks say that a google advanced search specifying the site freerepublic.com is a good way to find what you‘re looking for here.
Also, one can replace the asterisk in the following URL with any word of interest to see if it already a Keyword (and new ones are still being added)
https://freerepublic.com/tag/*/index
You can do that with most search engines.
Enter what you are searching for and then add (no quotes) “site:sitename.com”
This will limit the search to that one specific site. I use this all the time