Boolean Search Operators:
AND- will make your search more specific. It means that both terms used must be included in the search results.
An example would be if you are looking to explore the religious aspects of Confucianism. You might enter the terms Confucian AND Religion. This would exclude search results that do not have both in the article.
OR - Will make your search broader. It means that either search term could be included in your search results.
An example would be maybe you were looking for a couple of sects within a religion.... So you typed in Sunni OR Shiites OR Islam. This would broaden your search to include both sects as well as the overall religion.
NOT- Is useful if you keep getting recurring things in your list outside of your interests in your search results.
An example would be if you are researching the company Amazon but you keep getting search results on Amazon warriors.... While they are interesting, this is distracting from the research so using Amazon NOT warriors would exclude them from the list. You will be surprised how useful this one can be!