First, Netflix is a third party and AVOV has nothing to do with Netflix content.
Second, Netflix only offers what they get contracts for. There are a lot of series out there that Netflix only offers the first couple of seasons even though there may be 5 or 6 seasons. Usually in time Netflix will negotiate their contract and add additional seasons to their line up. Wait a while and Netflix will add additional episodes (if there is a greater demand for them) or you can do as Laser915 says and just look it up on Kodi.