Hi Eduardo and welcome to the forum,
You really just have to develop a cross referencing system for your own convenience. For example, the first letter or two in the code denote the supplier's name. the third denotes the genre of product, E for electronics and so on. You can break your code down to make it as specific as you feel you need
If you enter all that into a date base or even just a spread sheet, that will make product matching as simple as you are going to get if your supplier doesn't have any stock codes to work from.
It is quite strange that the supplier has no identifying code at all, have you actually asked them for the codes?