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It is beneficial to use subject heading searches when looking for "nurse educator" articles. You may want to try searching CINAHL by using a search term AND a subject heading search. See the example below.
You may want to experiment with combining search terms (e.g., diabetes, sex education), with a variety of subject searches. For example you may want to try the subject heading "teaching methods" or "teaching materials" if those subject are helpful in your research.
This video gives an overview of how to browse and search subject headings.