As a brazilian, I receive a good number of tasks asking to search for brazilian sites, however the add-on rarely recognizes when the site is not american, or the site is in another language, even when the site the task is asking is one of the top results.
when you done the search the link will look like this google.com click on the addressbar and edit the com part to what ever brazilian google is (google.br maybe) and it will work but only do it in the brazilian needed sites