I have the first three, and I have read parts of all of them. Especially "Sorting and Searching".
It's reference material. You read it when you need it to get a much (much) better understanding of what you need to do to solve a problem. That's the point of reference material -- you don't have to read it except for the parts you need. That leaves your brain free to think of important things, like where you left your coffee cup.