On my local copy of your site I created a new Listing with some content that I knew meant it should be returned by a particular test search, and then created a new View on a new page to test it, and it worked.
So I returned to look at your View, and noticed that the Query Filter section was missing a filter for the text search input: there is even a warning about that in the editor, see the screenshot.
After clicking that button, a filter for text search field was added (second screenshot).
My test posts didn't match the other filter criteria, but when I removed that other query filter then the text search performed as expected on the front-end, finding the content of the checkboxes fields.
Please try the same on your own site, you should find that it works after updating the query filters.