Below are some links to aid you in understanding the difference between quantitative vs. qualitative research.

The following guide from New York University Libraries provides an excellent overview of finding qualitative studies.

Using the keywords provided on the homepage of NYU's above-linked guide as a basis for building a qualitative search string, below is a keyword search string that can aid in focusing on qualitative studies:

qualitative OR ethnograph* OR phenomenol* OR ethnonurs* OR "grounded theory" OR "purposive sample" OR "purposive sampling" OR hermeneutic* OR heuristic* OR semiotics OR "lived experience" OR "lived experiences" OR "life experience" OR "life experiences" OR narrative OR "action research" OR "observational method" OR "content analysis" OR "thematic analysis" OR "constant comparative method" OR "field study" OR "field studies" OR "theoretical sample" OR "discourse analysis" OR "discourse study" OR "focus group" OR "focus groups" OR "ethnological research" OR ethnomethodology OR ethnomethodological OR interview OR interviews OR interviewing OR interviewed OR belief* OR attitude* OR perception* OR opinion*