I want scholarship for PhD in accounting and finance in USA. I have an interest to learn my PhD in order to serve my country Ethiopia and the rest world throuh my life by generating a medium level of income to me.

There is normally none, there are often work programs where you do research or teach for the university. Some nations (yours) often help for people who will return to their country, (you will need to check with yours) Also some business may offer you work.

Accounting Doctoral Program | Welcome (http://adsphd.org/)

List of Accounting Scholarships (http://www.mastersinaccounting.info/resources/accounting-scholarships/)

Accounting Program Scholarships | Naveen Jindal School of Management (http://jindal.utdallas.edu/accounting/scholarships/)

Google is your friend.