You can use the address bar (omnibox) as a search box. It automatically uses Google, but you can set another default search engine instead.

Set your default search engine

1. On your computer, open Chrome.
2. At the top right, click More Settings.
3. Under "Search engine," next to "Search engine used in the address bar," click the Down arrow .
4. Select a new default search engine.

If you've tried to set your search engine but it doesn't work, try resetting your device. These instructions are located in the solutions article 

Add, edit, or remove other search engines

1. On your computer, open Chrome.
2. At the top right, click More Settings.
3. Under "Search engine," click Manage search engines.
4. Find "Other search engines."
   • Add: To the right of "Other search engines," click Add. Fill out the text fields and click Add.
   • Set as default: To the right of the search engine, click More Make default.
   • Edit: To the right of the search engine, click More Edit.
   • Delete: To the right of the search engine, click More Remove from list.