You are correct, it's not possible to use double "word" filters. However, you can use "word" and either "description" or "name" to act as additional filters.
"description" searches the product description field.
"name" searches the product name field.
In order to use "description" you must upgrade your Datafeedr plugin to the newest version. That can be done at the bottom of this page: WordPress Admin Area > Tools > Datafeedr