Handling linguistics/mispellings is way beyond the plugins capabilities – as we are not using a 3rd party service for subscription fees to handle the search queries, everything runs on your local server, and there are no recurring nor monthly fees for that.
You can use the autcomplete feature, and select the post categories as the source: https://i.imgur.com/5AgvdUR.png
That way the plugin will run a spellcheck function for the suggestions, and suggest keywords for possible mispellings.
