For Qualitative Research Topics, cut and paste the following in the second or third search box in the Advanced Search in EBSCOHOST or Proquest:
(interview* OR discussion* OR “focus group” OR “focus groups” OR qualitative OR ethnograph* OR fieldwork OR “field work” OR “key informant” OR “interviews as topic” OR “focus groups” OR narration OR "qualitative research" OR "personal narratives as topic" OR "phenomenological" OR "case study")
One trick to becoming a good researcher is learning how to use MESH subject headings in your CINAHL searches. This short video explains it all.