The psychology database PsycInfo allow you to limit by methodology.
Type in your search terms in the search boxes. Below the three search boxes, you will see a number of available limits, one of which is Methodology. Among the choices, you will find Qualitative Study. You can apply this limit and run your search. Keep in mind this limits the search to articles that have been tagged as qualitative studies, so it might cut out some articles you would find useful.
If you are using a database that does not have a methodology filter, you can try putting your topic in one search box and add the word qualitative as a keyword or the name of a type of qualitative research (ex: narrative), in one of the search boxes. However, it is important to understand the characteristics of qualitative research so you can identify it on your own.
