Are kisa and sa ki interchangeable for "what?" Or do you just use "sa", what is the "ki" for?

What can be translated in Haitian Creole as: kisa, kisa ki, sa, or sa ki
Check ou this link:
http://www.sweetcoconuts.blogspot.com/2011/08/when-do-you-say-kisa-vs-kisa-ki.html

Ask me anything