The 7 Days example really isn't that clean. The short form domain name, 7dvt -- the main domain -- uses the long form, sevendaysvt, as the link to the home page on every page. And there's also a a bunch of subdomains hanging off the long form name.
Looks like they simply confused the heck out of G and shows how G can be a bit buggy. Bing returns the short form home page when searching for the long, but does not confuse the two.