Hello Leandro,
Our theme searches by title, description, SKU, posts, and pages, but does not search by tags, brands, or categories. For more information, please refer to the following link: https://www.8theme.com/topic/include-brands-in-search-results/.
If you would like to request that this feature be added, you can post your request on our Taskboard at https://www.8theme.com/taskboard/. If it receives enough votes from other customers, our development team will consider adding it in one of our upcoming updates.
Best Regards,
8Theme’s Team