Identifying key concepts and what other words or phrases describe that concept you will get more meaningful results. Here is an example of how you can break down a question into concepts and their related phrases.
|Original Phrase||Related words or ideas|
|eyewitness testimony||eyewitness identification/misidentification, false testimony, police lineup, eyewitness errors, lineup identification, eyewitness evidence, eyewitness memory|
|wrongful conviction||innocence, false imprisonment, exoneration, false arrest, wrongful incarceration, criminal justice errors|
|how often||statistics, data, history, frequency, extent|