You may be interested in a collection of oral teachings by Lao-Tseu which are in a collection called Hua Hu Ching. I believe they have been compiled by an american writer Mr Brian Walker.
It seems that the book might be a "forgery" from around the 4th century CE. I checked it out a little, and I guess it could be regarded as a kind of commentary of the Tao Te Ching, in the form of a dialogue.
Frankly, it's enough of a headache to grasp the TTC
Actually, I made an interpretation of it in Swedish, and right now I am working on an English version of it. Wish me luck - I sure need it.