Killing acacia brush

I hope you don't mind me asking this question. I am English but I live in Hungary. Due to lack of the language I have not been able to solve this problem myself.  

I had some young acacia tree cut down, that had self-seeded, over quite a large area of an abandoned garden. I returned a month later and there are now 3ft high acacia shrubs all over the ground. 

I tried to buy some herbicide that contained glyphosate but it is banned here. 

Can you please tell me how I can get rid of them?

Thank you in anticipation of your help.