Qualitative research is defined as research that derives data from observation, interviews, or verbal interactions and focuses on the meanings and interpretations of the participants. (Holloway and Wheeler, 1995).
1. Use thesaurus terms. Qualitative research is indexed in PubMed as "Qualitative Research" or "Nursing Methodology Research", while in CINAHL, the subject heading "Qualitative Studies" is complemented by more detailed terms, including "Phenomenological Research" and "Grounded Theory".
2. Use text words. For example: qualitative, ethnographic, lived experience, life experiences, observational method, content analysis, field study, theoretical sample, focus group, ethnological research, interview.
3. Use qualitative research filters. See http://www.nlm.nih.gov/nichsr/hedges/HSR_queries_table.html