What do the setting for your relation look like? Does the sheet you are relating to contain any data? What does the first column of that related sheet look like?
Based on your screenshots, your Autor column contains Eduardo and Lily. Your Nome do recurso column contain Didatil, Didatox, and Didateiro. There are no matching values between the two columns, so there is nothing for the relation to return.
If you are trying to get all resources related to the author, then you need to relate the author to the author. Not the author to the resource.