I found REJECT444's solution far too random and time consuming I appreciate it worked for him but the chance of BANDITS coming out is ridiculously low so i used a more creative way.
The method i used was to wait until i had part of the word, eg ITS.
I then used http://wordsolver.net/solve#!q=erdlsoiabivysek&dic=d_twl...
and I attempted to use up every single letter other than the ones i needed. i then got an A, I repeated the method only using letters that I wanted replacing.
The letters in BANDITS are actually really common and i was surprised i got this on my first attempt as i previously thought i would never get it.
i recommend doing this on either a level that has multiple enemies are tough enemies that won't die in 1 hit. You don't need to use the Wordsolver but it will get rid of the excess letters very quickly and increase the chance of getting letters you want.