If you are looking to filter a Trend report based on any set of criteria, here are the steps to follow:
Run an article search with your keywords and add any filters you have in mind on the left-hand side
Click Save Search in the top-right corner
Navigate to Trends and select the Saved Search
You can add up to 10 Saved Searches or queries to a Trend report. Each Saved Search can show up to the most recent 12 months of articles published.