Simply add YouTube as a search engine in your browser and assign a key to it "y", it's easier to search from your URL bar, saves a page load and is possible to do in most browsers.
I use https://www.youglish.com for this. It was made to help people learn how to pronounce words by showing videos that contained a certain word, but I use it as a search engine.
Does that work similarly? Looking at CC text, I mean.