not provided because Google has decided not to send the search terms in its referer URL to your site.
Traffic Source ->Search Engine Optimzation -> Queries shows selected data from Google Webmaster Tools if you have connected it to your Google Analytics account. This is only data from Google searches - or, more technically, it shows search results directly from Google's servers. Unlike Analytics, the data doesn't go back very far, is only an estimate, and cannot be analyzed with other Analytic data like browser, device, etc. However, it does show all Google terms, including the