Conducting systematic searches involves: 
3.1 Developing a search strategy
3.2 Thinking about text mining and search filters (if you're doing a full review)
3.3 Deciding where to search and searching
3.4 Documenting your search strategy
3.5 Reviewing and updating your search
Searching is a critical part of conducting the systematic review as it provides the evidence base for your research. Incomplete searches leave you open to biased results. If you are doing a full systematic review, your search strategy needs to be:
Yale University Library has some really useful videos about systematically searching the literature: Systematic Searches.
Before you start searching for studies to support your review, it's a good idea to make sure that a review doesn't already exist on your topic, or that a protocol hasn't already been registered. You might find that your subject has been covered, but needs updating. Here are some places to check:
Healthcare Research
Other disciplines
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