• Go to PsycInfo 
• Limit to Qualitative study. Enter your topic in the Search box. In the Limit Your Results section, select Qualitative Study, Interview, or Focus Groups under the Methodology drop-down menu. Click Search.
• Use subject terms, such as qualitative research, grounded theory, interviews, observation methods.

McKibbon KA, Wilczynski NL, Haynes RB. Developing optimal search strategies for retrieving qualitative studies in PsycInfo. Evaluation & the Health Professions 2006;29(4):440-54.