Hi again,
“I already know that is possible filter by attrbutes, but what I want is to search not just by titles but also by product specifications.”
I thought you meant searching the product attributes content, not using options on front-end.
If you want to make a dropdown/checkbox/radio etc.. visible filters for product attributes, then you need to create custom field filters: https://goo.gl/6dKjaP
Best,Ernest Marcinko
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