Basset Hound 9years problem undergoing in the nose

Hello to you all.

I have a Basset Hound with 9 years and for about 6 months he is with nose problems. At first, he only sneezed, but then it got more complicated, he was always licking his nose and his nose was always wet and "droping" a kind of mucosis. We went to the Vet and he said it could be something that got inside his nose while walking in the street and smelling the floor. They made a x-ray and more recently a biopsia that was inconclusive. Today we had to go with him urgently to the vet because he was nose bleeding very much. 2 months ago he had a slight bleeding and when we told the Vet he gave him some antybiothic and it stopped but the nose mucosis was always there.
The vets dont know what to do and dont know what it is.
Well, I gotta tell you, I live in Portugal and we are so undeveloped in some things that I am affraid they cant help my dog.
Any sugestions? I would be very grateful.
Thanks in advance and I am sorry for my, not so good, English.