I've got an idea for which I need to find/scrape other keywords from scientific papers matched by one of keywords. I have only once did search via PoP (https://harzing.com/resources/publish-or-perish), but I don't see the other keywords in the results.
I checked the scholar package for R (https://cran.r-project.org/web/packages/scholar/index.html), but I don't see what I'm looking for there.
What tool would you recommend for that?