Let the Australia Awards office in Vietnam know in advance if you have special requirements as these can easily be arranged for you.  You should also advise your Student Contact Officer, either when you arrive in Australia or later if you encounter difficulties.
Your institution is required to provide on-campus support and ensure access and equity for all students, including those with disability. The Australian Government will provide off-campus support for students with disability.
Generally, if you have a disability, you will find services and facilities in Australia are well planned and easy to access. Australians are helpful and easy going, and do not discriminate against those with disability. Most community-based services and facilities, including public transport, restaurants, shopping centres and public libraries, are accessible for people with disability.