Rename - Find and Replace problem

Hello people,

Currently i have problem using the 'Rename - Find and Replace'

I try to change the 'tm' into 'twelve men' for mutiple files , i.e tm11, tm12, tm13 into twelve men 11, twelve men 12, twelve men 13
it seems doesn't change.
Last time i did , I can do it, with mutiple files, but now it seems i can't, it didn't change.
what's seems i do wrong?

Thanks for your help

Make sure there isn't a stray space at the end of your "find" string.

aww yes, thank you
should not have any 'space' after the 'tm'
thanks again