When you “Google” things, sometimes this means you’re looking for something you’ve searched before.  Google Search is making it easier for you to tap into that by surfacing your “Relevant history” to the top of the search results. It shows you three of the most relevant pages from your browsing history. There is also a View More link to show you other relevant links. These results are meant for your own viewing and convenience. It doesn’t seem to be rolled out to all users yet and looks like a server-side test. It hasn’t shown up for us just yet. Is this a feature you’ll find useful? 

Source: Android Police