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 or research question: “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?” = Television, Violence, Children. Leave out the small, common words that would be found in hundreds of irrelevant articles, e.g. What, Is, The, Effect, Of, On. Choose keywords that represent the main ideas of your topic.
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:
You can add special symbols called "wildcards" to a search term in order to receive more results. Often times this is used if a you're not familiar with a spelling, a word has multiple spellings, or you're trying to recall specific information. Different search tools, databases, and database providers utilize different wildcard characters, but the asterisk or "star" (*) is one of the most commonly used.
Truncation allows you to search various forms of a word by finding alternate endings. The wildcard character is placed at the end of the first few letters of a search term or at the end of its root. A root is the base or most simplified form of a word.
For example, using the search terms "Indian*" may find information containing "Indian, Indians, Indiana, Indianapolis"
Each database or database provider utilizes different wildcard characters and may have restrictions such as searching no less than 3 letters to achieve results.