To search for qualitative research in PubMed, you will want to use the Advanced Search. Choose MeSH Terms from the drop down and then type in qualitative research. Press ADD to add the term to the Query Box below. Then, change the drop down to All Fields again and type in your other search terms, adding them to the Query Box as appropriate.

The strategy for searching for Quantitative Research is different in PubMed.
1. Run your search for your search terms.
2. When looking at the results list, you will use the limiters to choose the type of quantitative studies you would like included in your search results.
3. Choose additional filters on the left hand side.

4. Choose any of these article types and press show (clinical trials -- all types, comparative study, controlled clinical trial, evaluation study, meta-analysis, randomized controlled trial, systematic review, twin study, validation study).

5. Once you choose the limiters you would like, they are now shown on the left-hand side. Click the appropriate article type filter to filter t just those types of articles in your result list.
Remember: Meta-Analysis and Systematic Reviews are secondary sources. Refresh your memory on the difference between primary and secondary sources here.
Search PubMed directly by using this link: