What does it mean if nothing appears on doing search on the domain?

search for
site:domain.extension
you get results about your site is crawled or not
 
It means site is deindexed. It can mean either that the site has a manual penalty or the site simply has been offline for too long and Google has no reason to keep it in index.
 
check your website
site:domain.extension

If found nothing, then
1.) check your website source code and try to find (robots tag)
2.) Check webmaster tools
3.) Check robots.txt
 
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