It is easy to add any website as you default search engine in Chrome. We can do this in two ways.
1) Open a new tab / new window in Chrome and right click on the address bar. Select -> Edit Search Engines
2) Open Chrome's settings window and click on Manage Search Engines
This window will show your default search engines and a lot other available search engines.
Scroll all the way to the down and add any of your favorite website and Click OK.
Open Manage search engines window and hover over your website and Click Make Default.
Now any keywords you search in Chrome's address bar will be searched on your website.