What is the reason I am not receiving response to my applications for jobs?

Most likely because there are almost NO jobs right now. People are getting laid off everywhere, and there are people with high educational degrees who can't find anything at all. I know of someone who lost her job at NBC/Universal (A GE company), and right now she can't even find work at McDonalds. I'm not saying there is anything wrong with McDonalds, but college degrees and long term study is not a requirement to work there. Hopefully the economy picks up globally, and jobs will flourish. You obviously have worked hard enough to deserve a good job. There simply aren't any.