It looks like the Cortana team is continuing to update and improve search results usingCortana in Windows 10. A cursory glance at local search results using Windows 10 for PC (not mobile) reveals that search strings can now break down the results by category such as apps, files, settings, and the web. Those categories can thing work as filters letting you narrow down the results you are searching.
Previously, Cortana just displayed results with only a general 'My Stuff' and 'Web' categories near the bottom. Those remain but the new filters will be available at the top of the results page.
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