Comparing search results

I wanted to find some materials to read to improve some skills, so I searched for "Improving Business Strategy Skills", without the quotes. None of the following resulted in anything useful for me, so I guess I need to refine my search. However, I figured it might be interesting to share my search results along with a few of my (comments):  

MSN (the results were identical to Yahoo)  (notice this wasn't found on Amazon's A9)

MSN Beta

Google  (also found on A9)  (also found on A9)

A9  (also found on Google)  (also found on Google)