A common mistake students make is to search a database the same way they search Google. Avoid this mistake and your results will dramatically improve.
The database will interpret this search as a phrase, so only results where the words are next to each other will appear. An article called "Teens exhibit violent behavior after playing violent video games" will not appear, even though it may be exactly what you need.
In this search, the main concepts (keywords) are on different lines. You will get more results because the search is now more flexible.
Use AND / OR / NOT
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