Any good site/tool to for domain name

I'm planning to start a micro niche site, i already researched my keywords, it has low competition and lot of searches. But domain name matching my keyword is not available. I'm looking for tool that can help me generate domain names based on my keywords.

I already googled and tried all top 5 sites returned in result, but they don't work correctly or return good match.

my friend sell add on for domain search,
if u intresting i will ask about it to him