How I do exclude a "noindex" Page from Search Box results?

Hi, I have a page that I've chosen to be "noindex", "nofollow", and not included in the sitemap. However, it still shows up in the internal -- and public -- search box results for visitors at the site itself if keywords in it are searched for. I'd like to have it entirely excluded from those search results. What is the simplest way to do that? Thank you!