See the Campbell Collaboration, the source of this quotation, for more about helping people make well-informed decisions by preparing, maintaining and disseminating systematic reviews in education, crime and justice, and social welfare.
In any scholarly database, add keyword "systematic review" (in quotes, to indicate the entire phrase) to your search terms.
A true systematic review will (almost always) include the term in either the article's title or abstract.
Use search fields and thesauri if available in those structured databases.
"Meta-analysis is the quantitative synthesis of results of multiple studies. It can estimate trends, assess variations across studies, and correct for errors and bias in a body of research."
Julia H. Littell "Meta-Analysis" The Encyclopedia of Social Work. Ed. Terry Mizrahi and Larry E. Davis. 2008 National Association of Social Workers and Oxford University Press, Inc.
In any scholarly database, add keyword "meta-analysis" (no quotes needed) to your search terms.
Step B:
Use search fields and thesauri if available in those structured databases.