Cloud Oriented Architecture

I come across this architecture and i expect to analyze more on this. What i know at this time is, in order to develop an application on cloud, we have to follow one architecture and that is coined as the term, COA - Cloud Oriented Architecture. Since this is the new term, if we Google it, its not coming in the first page. But when i tried for, SOA - Service Oriented Architecture, its coming first. Its tells that SOA is more popular. But i need to do clear analysis on both.