When using multiple keyword with the + and - signs, it graphs the sum of all posts requiring one technology in addition to all posts requiring the other technol

When using multiple keyword with the + and - signs, it graphs the sum of all posts requiring one technology in addition to all posts requiring the other technology. It'd be great if there was a way to graph sum of all posts that require both (or more) technologies. I have tried with spaces and comas etc... (eg: 'rust, python') but it doesn't work well as you have to guess exact matches (so 'rust, python' is a different result than 'python, rust').