How to control this Weed.

[slong1958]

Hi guys
I cut grass for a living and I've been seeing alot of virginia buttonweed in yards.I have it in my yard also and I would like to get a handle on this before it gets out of control.I've tried spraying MSMA on it,it burns it real good but within a couple of weeks it comes back.There has got to be something out there that will put a hurting on this nuisance weed.

Thanks