I think what trying to exclude the .br TLD. Have you tried the "site:" syntax which can include or exclude domains. Loke this:

teste de lingua portuguesa -site:.br

I often do it this way because it used worked in the past, and it works in other search engines.

Well this is a more complex case which includes combining negation with quotation and punctuation marks. I'll bet those factors explain why it didn't work.

Searching for 'Edgar Allen Poe -"The Raven"' does work as intended.

The search I printed was trying to omit some addresses (and I now realize quotes are not necessary and do not help for this specific case), but it did find a result with the term I was trying to avoid as a string.

I'm not an expert, but isn't this as simple as "omitting results that have whatever is found inside the quotes"?