How old is the site?
How long have the forums been online at the current domain/URL?
Have you tried submitting a sitemap?
Do you have links from relevant external sites?
Is the site loaded with an iframe?
Does the site have any unique content?
Have you SEO'd your vBulletin any?
SEO is a slow process, its not over night until your site gets large and Google starts to crawl it non-stop will you notice immediate changes in the search engines.
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