Why history search results are different in Spotlight and in Safari search bar

Sometimes I want to search for a website I visited earlier. So I type a couple of words in Spotlight and nothing useful shows up. When I enter the same words in search bar in Safari I find the result I am interested in. Why doesn’t Spotlight show the same results as in search bar in Safari? When I type some query words in Safari history using CommandY I can find even more results. Is there a way to find more information from Safari history on Spotlight? We can see that it shows completely different results.