Filter Combo box or make combo box searchable

Question

I have two combobxo. One is Product and second is Model No.

When i am selecting any product from Product combo box associated Model_no fill into Model combo box but one product having thousand of model's.

I want to filter data into Model combo box.

Suppose If model no is : LED UA65ES8000 

When i type 65 into Model Combo box all  model no should come those having 65