Google is continously testing different areas to place the related searches in a more prominent position, but it couldn’t figured out, the right place yet. Related searches are currently displayed at the bottom of the search results pages and include queries that narrow or expand your search. Last year, Google added two experimental views that placed the related searches at the left and at the right of the page. The two experiments have been removed from Google Labs and now Google tests another location: below the search box.
Google, Search, Web Search, Search Result