Here is a quick tip from Microsoft about using filters in Outlook 2013 searches to make searching quicker and more efficient:
When searching for a particular message, you might remember that it contained an attachment, was marked important, or was received last week. To find a message based on certain criteria, the Filter Email command provides fast access to the most frequently used Instant Searches.
Click Home, and then in the Find group, click Filter Email.
When you use a filter, the same Search Tools tab appears on the ribbon as when you click in the Instant Search box.
To clear the search results and view all items in the selected mail folder, click 
in the Instant Search box, or on the Search tab, in the Close group, click Close Search.
to clear the search resultsAbout Advanced Network Consulting:
Take the worry out of tending to day-to-day technology issues and start concentrating on your business. Let Advanced Network Consulting maintain and secure your network. For nearly 20 years, we’ve been servicing LA & Orange County small and medium size businesses with desktop issues, network maintenance, server upgrades, and data security. We’ve experienced everything from installing network cabling newly built offices to complex server migrations and upgrades. Our Microsoft and Cisco Certified technicians are professional, personable, and prompt. To find out more on how we use technology to your advantage, call 562.903.3992 for a complimentary onsite meeting. We look forward to meeting you.