Searching for articles that include specific research methodologies can be tricky depending on where you look. Some databases allow you to limit by specific methodologies:
You can also add the type of methodology to your search terms. You may find that some articles have labels or subjects signifying that they are qualitative and quantitative studies, or articles may mention that the study used a survey, questionnaire, or focus group to collect data. Try adding the type of methodology to your search terms, scan through a resulting article, and verify that it includes the methodology you are looking for.