The Chiss world is Csilla (pronounced Chillah), not Chiss, LOL.:p Very true. I knew that... actually, I did, but I was having a brain failure that day, and I knew it.
I know all this from rather extensive reading of the CUSWE, Nathan Butler's SWTimelineGold, and a number of other reference sources online. As well as a bit of speculation from reading I've done of late. I really doubt they can use the force, you need to go to
http://www.theforce.net) and do some research in their encyclopedia (
http://www1.theforce.net/cuswe). Actually, as I said, there's almost no doubt that there are (or can be) at least some Force-sensitives in the mix: they're only less than ten millennia removed from standard humans. So there's little likelihood they would have lost the ability to use the Force completely in that time. Also - the Yuuzhan Vong really aren't relevant to a discussion of the Chiss...