Type chrome://settings in the address bar and press enter
Click Manage search engines
Click the ADD button
Type bhw in the Search engine and keyword field.
Copy paste this code in the last field :
Press ADD button.
Step 1 : Install this Google Chrome Extension :
Step 2 : After the extension is installed, navigate to this page and submit your email address.
Step 3 : You'll receive an email with the API Key. Copy it and paste it here.
Now search your favourite keyword in Google to see it's search volume...