[X4U] Make the Junk filter do a better job?

[nk]

lately, I've been getting boatloads of spam from companies who want  
to make a certain part of my body get bigger...

I've been tagging as Junk 5, 10, 20 of these things per day, and  
still they come...I've taken a look at the "Advanced" Button under  
the Junk Mail in Mail.app, and not sure the best way to start adding  
conditions, because "real" mail which you want can have  some of the  
phrases these clowns use.

Anybody tinker with this and have successes to report?

thanks!

nk