Your search becomes: video games and violence and children
When doing a keyword search, try to find one article that is exactly what you need.
Look at its subject terms and re-do search with those index (subject/controlled vocabulary) terms
If the journal article index has a Thesaurus or Subject Guide, look there to find correct search terms for your topic.
Did you find too many articles?
Use more specific search terms
Limit by language, publication, date, full text, peer reviewed.
Use controlled vocabulary (look in the database subject guide or thesaurus)
Narrow your search with AND
Did you find too few articles? None? Out-of-context?
Use different search terms, synonyms, alternate terms and phrases
Check your spelling
Use truncation (child* = child, child's, children and other words that begin with child. )
Broaden your search by joining synonyms with OR
Search a different journal index
Ask for help!!!