I am looking for the comments and analysis of the FedEx's business
descisions in the last few years from the financial and accounting
perspectives. Is there any resource I can look into? thanks.

I would get to the nearest library where you have access to a large
database of analyst reports.  Where I am, the most well-known source
is Investext, but there are others.  In my opinion, this is a question
that will require some time and effort, even if you enlist the help of
a business librarian/researcher.

If you're near a University with an MBA program, You might visit that
library's bank of resources.

Good luck!