Documents are being displayed with a title equivalent to first words in document in search results. How can I change this to use the file name?

My search results in my enterprise search aren't displaying the file name or title property. Instead, they're showing the first words of the actual document content as the title. For example, we have a policy titled "Cash Counting for Associates". If I search "cash counting", it's coming back just fine. However, the title displayed in the results is "Policies and Procedures", which are the first words in the actual document.

Why is it doing this? How can I change this so that it will try to use the title property, and if that's blank, use the file name as the title in the result?