Why we can not fulfill our desires? What characteristics in universe have that doesn't let us to fulfill our desires ?

Why we get more and more desires through fulfilling desires ? (What characteristics of desires have that we have to know to understand better about desires)
Excellent question. 

The reason why we can't full-fill our desires is because of the impermanent nature in the world. Everything around us is subjected to impermanence. This includes the happiness that we get from worldly things. 

For example:
You buy a car(because you desire), now your happy. Then you get bored overtime, and you want a better car.  Because your satisfaction is impermanent. You had the satisfaction when you bought it but then it died away. So you buy a better car (to full-fill your deep desires). Then two cars, then five cars. Someday, you can have all the cars in the world and still not end up satisfied. Because your satisfactions are impermanent. Its born and it dies. Like everything else in this universe.

So the simple answer to  your question "Why we get more and more desires through fulfilling desires ? (What characteristics of desires have that we have to know to understand better about desires)":
 
Impermanence in this universe or Impermanence in satisfaction of desires to be specific.