Searching as part of a Systematic Review (SR) is a somewhat different process than searching as part of a literature review or for a case study, but there are structured flow charts and checklists to help you work through the process. There are many other aspects of a SR, but this guide is just focused on searching and finding literature.
Before you start searching, you need to articulate several things so that you don't miss relevant studies, duplicate an existing SR, or collect biased results.
Step 1: Define your question.
Step 2: Check if there's already a recent SR on your question.
Step 3: Formulate your search strategy and inclusion/exclusion criteria.
Step 4: Dress rehearsal search.
Tip: If you've found too few results, try another database, a citation search or look at the methods section of a related SR.
Tip: If you've found too many results, add further limits (population, intervention, etc.)
Step 5: Document the search strategy.
Step 6: Logistics
These are a few search strategies for as you start your process: