Thanks for the fast response Jan. I thought it was supposed to be 'all', but it doesn't seem to be working. Maybe I will try capitalizing it. Also, does it need to be in quotes when I send it?
I thought maybe the problem is that it is only picking up the first of my search_keywords, but I just played around with that a bit and found one that matched on only the last keyword, so that part seems to be working OK, except it is using OR instead of AND.