When you perform a search via the Omnibox, Chrome will display suggestions from Google’s top results as well as your personal bookmarks, your browsing history and previous typed URLs.
So, what would you do if for whatever reason you did not want all of that extra information to display when performing a search in the Omnibox? Meaning, you only want to see Google’s top suggestions displayed. Well, you’d use this quick little trick. Type a question mark in the Omnibox and then begin to type your search query (ie. ?technology). Now, you should only see web search suggestions displayed, minus your browsing history and everything else.
As an added bonus and an additional way to protect your privacy, if you use the question mark trick in Incognito mode, Chrome will only show suggestions from your search history. via Google Operating System
