Keywords in a text box

Hi All-

I am using Storyline to create some e-learning for law enforcement (great tool by the way!), wondering if there is a way to just plug in keywords in the answer field on the backend so that when a user types in any text that includes one of the keywords I've selected as an appropriate answer the system will count it as successful response?  In my current course I'm using different video scenarios and asking users to tell me what they see in short video clips.  There could be a number of ways to answer, and so long as the user hits on keywords then I would like to be able to proceed forward or provide remedial feedback as needed.  I've tried the "freeform" text entry field, but it looks like all I can do is enter the different ways a user can answer and hope the user types in one of the answers I've included (word for word).  Any thoughts on how I can just key in on keywords?  Tks

Jim