Q. What tips can you provide on finding specific types of research through the online library databses? The topic of the study is flexible yet I

If you topic is flexible, then your best bet for ease of finding these types of research is PsychInfo (psychology & management topics). In the advanced search you can limit you results to types of methodology, including at least the quantitative & qualitative items on your list.

CINAHL (nursing, OT, PT, & EXP) allows you to limit to primary research, but with not as many variants as PsychInfo.

Our other databases do not have this type of indexing. In these, you would need to try some tricks, such as limiting your search results to scholarly or peer-reviewed articles. Then (in the advanced search feature) search in the AB Abstract field for terms such as method* or survey or observational.  Then, in the search history, combine your peer-reviewed results with the various abstract terms (one at a time) using the Boolean operator AND.

And then there is always the low-tech way of doing a search, limit it to scholarly articles, and start reading abstracts till you find a study that matches your needs.

Good luck!