Does supplemental results really exists till now, I usually put site:www.domainfortesting.com/& in Google search, It throws lesser results. Am I doing the correct thing to check supplemental results please check and give suggestions.
When you type site:www.yourdomain.com in Google, the result it'll show are the indexed pages of the website that you input on the search bar. That result is not your so called "supplemental result". Please don't invent non-sense term that might lead some people to misconception.
read more about it here: http://googlewebmastercentral.blogspot.com/2007/07/supplemental-goes-mainstream.html