meaning - How to distinguish "two previous" from"previous two"?

a. His two previous books

b. His previous two books

.............

1. His 2 latest previous books


2. His 2 previous latest books


3. His previous latest 2 books


4. His latest previous 2 books


5. His previous 2 latest books


6. 
   

   His latest 2 previous books

   
   

   I am wondering what is the difference could be between these in meaning? Which one do you use? which one you don't use? I think just especially native speakers or learned ones in English can provide the most proper answer.

   
   
   

   Thanks