This URL pattern is one you will see after entering keywords into any WordPress site, so why would you need it?
The extra bits to add on to a WordPress site are
?s=keyword1+keyword2. I have made use of this on a few sites that do not have a search box. You could make use of this on your own site to create glossary, or to find terms over all posts that cannot be connected by tags or categories.
I can see maybe all of my blog posts that talk about splots (yes I know you may not know what they are, but a search would help): http://cogdogblog.com/?s=splot
But has Brian Lamb blogged about them? http://abject.ca/?s=splot
Terry Greene? https://learningnuggets.ca/?s=splot
Wow, it has even spread to the UK http://blog.edtechie.net/?s=splot
Again I can see some good use of spreadsheets to maybe have a list of all my student blogs, and use a formula to create links to search them for key terms they should be writing about. I can make these searches more efficient to do than visiting blogs manually and trying to find a search box.
But now let’s go beyond the easy stuff. I can figure out from my blog (inspecting the edit URLs for a category) that this link gives me all 28 posts in my Presenting category
But since I know some URL mojo, I can refine into a URL that shows all posts in that same category that include the word “splot” (11 total)
Does this crack open your eyes at all? We can combine bits and bobs (as they say over in Martin Weller’s country) of these URL tricks to make ones not possible otherwise.