help regarding purchasing domain

hi everyone
i am trying to buy a 6 months old domain with something like seo, backlink or any similar term in the domain name. I posted in the 'want to buy' section but didn't receive any response. can any one guide properly me where should i search for. Thanks

What's the topic that you want to work with? I think you should buy the old domains only if they are exact match of your main keyword. Otherwise left them.

futurestic06 : the topic is seo, backlinks related. so this isn't the issue