Search for the string "scheme", as his trends link shows. That's a pretty common term, while "scala", "lua" etc. have no meaning other than the language, at least as far as a job site is concerned.

www.indeed.com redirects to www.indeed.ch here, but there I get nine hits for "scala" and 153 for "scheme". The scheme hits are all "Creates validation scheme with manufacturing site" etc.

Scheme is a niche language, and it's niche is education. It's almost never used in industry because it lacks a single popular standard library adds enough functionality to make it practical to use in the real world. In general, you don't write a practical scheme application, you write a practical [insert implementation]-scheme application.

Erlang will never have the same appeal to the masses as Python, not will it be as efficient at everyday scripting tasks.