Unfortunately, I could only get 3 of these videos as the author has removed the rest from youtube.
You can visit her website to get more information on this technique.
I find that there is some variation on the sounds.
http://www.womensqigong.com/
This website is also useful for further information.
http://www.qigonghealingarts.org/qigong-exercises/qigong-healing-sounds-and-five-element-theory/
WATER - Kidneys
WOOD - Liver
METAL - Lungs