Because a systematic review attempts to be rigorous and unbiased, readers must be able to replicate your searches.
You might also need to:
For these reasons, record information about your search as you conduct it.
Source: “Researching the Exhibit,” MLibrary 
Most major databases allow you to save your searches. This avoids retyping many lines of text when you want to reuse the same strategy.
To save your searches, you will usually need to create a free account with each database.
Web of Science save searches option.
To continue to use the same search over time, or to stay on top of the field, you can receive email alerts every time a new article that fits your search is added to a database.
As with saving your searches, setting up an alert is usually done by making a free account.
Scopus set alert and set feed options.
Keep a list as you go with this information (using a spreadsheet, an online or paper checklist, or a Word document):
The Cochrane Handbook section 4.5 offers further guidelines for documenting your methodology. The UofT Libraries' Citing Sources guide also provides some tips and handouts to help you track your research.
Articles and books are easier to manage if you use citation management software. These tools save time and effort by collecting and organizing citations from books, articles, or other kinds of media so that you can find information easily and in the same place.
Most programs will also help you create a bibliography from your references.