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Below are examples of how you can combine search terms and narrow your query. Your search terms can be broad to gain an overview of a topic or narrow for more specific results. A broad term would be mood disorder, which would return a large number of hits for disorders that fall under this general umbrella. A more narrow term would be bipolar disorder, which is a specific mood disorder. Such terms can be used on their own or combined with others to discover topics that may interest you. For example, use two phrases in an advanced search to narrow your results: mood disorder AND cognitive behavioral therapy will provide a list of articles discussing the various issues surrounding the treatment of mood disorders using cognitive behavioral therapy.
If you find far too many search results even after combining search terms, try altering and/or adding some terms. In the example above, I found over 74,187 results- but when I changed my search and added a third phrase (mood disorder AND cognitive behavioral therapy AND recovery), I narrowed my results to 20,458.