What is a Broader Term?
As the name implies, here, a broader term is one that encompasses a wider "scope" for the materials included. When you aren't finding enough material to support your research, consider using a broader term to "widen your net."
In our example of endangered species, broader terms might include: "wildlife conservation," "nature conservation" or even "National Parks and Reserves." Each of these includes materials that will encompass our topic but will go beyond endangered species.