Mark Hoffman posted a blog on Finding Hebrew words translated by a Greek word in the LXX, comparing Logos, Accordance and Bibleworks. It's well worth a read.
I'm posting here, partly to encourage you to read his article, and partly because I wanted, in response, to say more than I could squeeze into a blog comment. I've got two things to add. (You'll need to read Mark's article to get the context for my comments.)
First, when you're searching by Greek lemma, if you include the Lexham Hebrew Bible (rather than the BHS), you'll get sympathetic highlighting in the results.

Second, Mark pointed out it's not easy to get a simple list of all the Hebrew lemmas for a specific Greek lemma. That's true, but…
…either you can export an analysis search to Excel, delete all the columns except the lemmas, select the data, choose Advanced Filter from the Data tab, and check Unique records only. Not simple, but relatively easy once you know how.
…or, in the Logos Bible Word Study, click on the Greek lemma in the centre of the wheel, so that all the Hebrew results are displayed below. Then right-click on the Septagint Translation heading, and choose copy. That will copy the contents of the panel in a editable format. Here's what it looks like pasted into Word. (Oddly, if you right-click on the results themselves and choose copy, you get the results as an image instead).

If you just want the headings, and not the contents of each verse it's very easy to delete them. Just put your cursor in one of the verses and choose Select Text with Similar Formatting from the Home tab (it's on the right). Then hit Delete on the keyboard. You'll be left with this:

But the easiest way is simply to open the entry in the Lexham Analytical Lexicon of the Septuagint. No searching required!
