Unfortunately neither the native nor the Chrome Postman app are particularly great with HTML previews, especially with dynamic content, such as the search results you have on your screenshot.
If you check the Raw tab, you'll see the actual HTML code returned, and if you just want to look at the page, you might as well use your browser.
The point of Postman is mostly that you can process the response, either to assert some of the values, or to use them in a subsequent API call.
If you're just getting started with Postman and trying to figure out how it works, you cold use a free public API for practicing. Something that returns JSON. You can find good free ones on ProgrammableWeb.
Or if you actually want to process google search results, then use the API: https://developers.google.com/custom-search/json-api/v1/overview