I've learnt with experience, to get a really bright green by mixing yellow into green paint. To gain fluro green, it may have to be fluro yellow paint.
But generally, gradually stirring in a little bit of yellow, and every now and then more green to make sure it doesn't go olive, it tends to brighten green up.
You get the color turquoise when you mix green and blue.
green
green
Green.
You get blue-green.
Orange
you get green
a brownish shade
Chartreuse
Brown.
Yellow and blue
green