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Google Inc. is giving Web surfers a few more ways to refine their search results, signaling its resolve to ward off rival Microsoft Corp.'s aggressive campaign to lure traffic.
The changes announced Thursday might be hard to notice because they require clicking on a "show options" link above Google's search results. The feature has been around since May, making it possible to focus the results exclusively on videos, discussion forums, reviews or books. Now news and blogs are joining the list of options.
Microsoft introduced similar features for limiting search results to specific categories as part of a June upgrade that renamed its search engine as Bing.