It does not seem to work. This includes your cnn.com example. Your home page is displayed instead.
Should be working now.
Ah, you did not mention the URL has to contain a query. I assumed that mydomain.com.samuru.com would either display all mydomain.com pages you have indexed, or otherwise indicate that I will be searching within mydomain.com.
put your companies name on the front of Samuru
http://cnn.com.samuru.com does cnn.com
If you want to search your company just put mycompany.com on the front.
That will let you see if you would like the results.