Results you retrieve from Google searches are found on the surface web where information is not evaluated. Results from library databases are found on the deep web where information is evaluated. With Google searches you're finding only the tip of the iceberg.
Library databases help you find information that has been vetted and checked for accuracy. Also, library databases help you find articles that you can't find via Google.
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New to SciFinder or need a refresher on how to search it? CAS has several short (> 5 min) tutorials that can help you to search SciFinder quickly and easily.