The search terms or keywords you use to search are what determine the results you get. Here's a good exercise to help you generate keywords:
1. Express your topic in a topic sentence: What is the effect of television violence on children?
2. Generate keyword search terms by identifying the main ideas or concepts within that topic sentence: "What is the effect of television violence on children?" = Effect, Television, Violence, or Television violence, and Children
3. Expand your search terms by brainstorming related terms or synonyms that describe your main ideas:
You can create complex search strategies by combining keywords using the linking words AND, OR and NOT. For example, if your search terms are mathematics and curriculum: