downloaded
http://www.gutenberg.org/ebooks/22044 in UTF-8
and have attached the results.
My Portuguese is as my Chinese - nada
As explained in previous post, these letters may not work with the dictionary correctly.
This seem connected to the coding of these letters, and furthermore - they may split words in ways you don't want. So the trouble is to be a bit more specific if possible.
As far as I can tell, the letters seem to be there - but when you don't read the language, it is difficult to spot how it should be.