An encyclopedia is a type of reference book. These are great resources for gathering background information on your topic, as well as for:
Below are a few resources where you can find reports on topics, definitions and encyclopedia article.
Credo Reference includes a great Mindmap tool to help you brainstorm topic ideas.
Since encyclopedia articles focus on basic, general information about a topic, what you type in the search box should also be general:
YES: "Video Games"
YES: "Video Games" and "addiction"
NO: How does video game addiction affect the socialization of teenagers?