Advance searching gives the database more specific information for your research question. Subject Headings is one way to do an advance search. The information, links, and video below will give you more direction on how to perform an advance search.
Subject headings are assigned words or phrases used in a database to organize articles and more.
You may also look at the Major Subjects and Minor Subjects in any article of interest to find terms that would be more helpful in your search.
Looking at similar articles may bring other relevant articles to your searching, but you will need to limit the search again by your keywords, dates, source/article type, etc.
You can go to CINAHL to search for Qualitative Research. One of the things you can do is to add the following concepts to your search:
(MH "Qualitative Studies+") OR (MM "Focus Groups") OR (MM "Interviews+") OR (MM "Narratives+") OR “focus groups” OR interviews)