Google is the biggest catalog of all software development rooms in the world. But to find the perfect IT BPO for your needs you have to spend a lot of your time. So I recommend to look for your perfect team on a special resources. You may try to experiment with Google using different keywords. But firstly you should decide what kind of project do you need and what technologies should be used for it. The good thing is to create a list of the companies which fits your needs, check their portfolio and read the blog.