Well, this is what happened:
I created a new Attribute set called "Nuevos Productos", then I added 20 products to that set. After that, I deleted the set by mistake and all the products were deleted too. How can I solve this!?
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If you have a backup u can solve it, if not your best option is to enter them again.
You can try this module for the future:
Once it is installed you will be able to undelete products, it only works with the product that are deleted after the module is installed.