Adjust your Alerts if you’re receiving irrelevant results (or no results at all). If you’re receiving irrelevant results from your Alerts, you may want to include additional keywords. If you aren’t receiving many (or any) results from your Alerts, you may want to remove terms.
Step 1: Navigate to your Alerts
Step 2: Select your Alert to edit
Step 3: Add or remove terms in Term to monitor and add or remove desired Filters
Step 4: Click Save alert
Here's a great guide on search best practices to help refine and target your results: Search Best Practices