How can I get a search box like this listed for my website?
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34answers:
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A:
http://googleblog.blogspot.com/2008/03/search-within-site-tale-of.html
This feature will now occur when we detect a high probability that a user wants more refined search results within a specific site.
Essentially, you can't. This is only likely to occur on high-traffic sites with usage cases that lend themselves to this sort of search-within-search.
ceejayoz
2009-12-22 17:32:42
It looks like when Google detects that a large percentage of your visitors go straight for the search box when they hit your homepage, you get the search box in your listing.
Josiah Sprague
2010-10-15 21:05:27