Плагин «Поиск товара по его тегам».
The default install of woocommerce does not come with any searching capabilities based on the tags that can be assigned to each product.
I have written this plugin to add this capability to the search on both the front end of your woocommerce site and in the wordpress admin site. There is no extra config apart from installation and activation of the plugin.
You can search by multiple tags by splitting your search with a comma. For example to search for all products tagged with toys and helicopter enter into the search box: “toys, helicopter” and all products with those tags will be returned in the search.
Источник: Search by Product Tag for Woocommerce | Matty L.