Olá, @dbuachalla. Unfortunately, you’ve asked the million-dollar question, I think 
Grammatically speaking, Portuguese is flexible in terms of word order (I think adjectives are the most movable class), but I think it’s very difficult to map any patterns, because each sentence is its own little universe and the words themselves can serve different functions from one phrase to another. This means, for example, that in one case, they may move, but in the other, they can’t. Or maybe, grammatically, it’s always fine to move them, but then the meaning changes, or one sounds Brazilian Portuguese and the other European. And so on. I can think of a few examples of all of these.
Are there any specific sentences/words that come to mind? Maybe we could work from those.