You can use the drop-downs in PsycINFO with AND, OR, and NOT to tell the database to include or exclude certain search terms. This will help you broaden, narrow, or focus your search.
AND: Putting AND in between keywords tells the database to get articles with all of these terms, which creates a narrower search.

example: social media AND loneliness AND teenagers will only bring back articles wth all of those words, so you'll get fewer articles.
OR: Putting OR in between keywords tells the database to get articles with any of these terms, which creates a broader search.

example: teenagers OR adolescents will bring back articles that mention either teenagers or adolescents. This creates a broader search.
NOT: putting NOT in front of a keyword tells the database not to bring back any articles with that keyword. This can create a more focused search, especially if there are aspects of the topic that you're not interested in.
