Virtual Host problem with google seo

I'm using virtual host at my server. I have hosted 3 website under that. Lets say,

when i'm searching at google using keywords like below, it is showing links from default website

I think google is taking IP address from the domain name, and then crawling my sites using IP. Browsing with IP will take you to my default website.

Is there any way to resolve the issue?
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Well, Google seem to think the blame lies with the server admins:

If you're the server admin, is this of any use:

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