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Overview
Advanced Find helps you find the Outlook messages you're looking for by using additional search criteria.
Classic Outlook
Enter your search terms in the search box at the top of the window in classic Outlook, then select the Advanced Search down-arrow on the right side of the box.
Tip: To open the classic Advanced Find dialog box, press Ctrl+Shift+F.
New Outlook
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In the Search box at the top of the window in new Outlook, enter your search term.
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On the right side of the Search box, select 
Filters.
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Add data to any field in the list to refine your search.
You can choose a specific folder to search in, specify a data range or a specific sender, and so on.
If you would like some extra tips on how to search for items within outlook check out this link: How to search in Outlook - Microsoft Support