When I was pregnant with my second, I played around with all of those baby prediction tests. There are the ones that combine a bunch of old wives' tales and also this chinese one that you mention.
I did both, several times, and I always came out 77% or higher in favor of a girl. I had a baby girl
Take note that I only did this for pure entertainment value. I didn't go out and buy a bunch of girlie baby stuff based on these tests. They are pretty fun though