Your husband cannot apply for a work visa. Work visas are issued to the Local Companies and people. Your husband should find out a suitable job for him and the Company who offer him a job will be the one applying work visa for your husband. He should have his Credentials with him to appear for an interview. He can submit his CV to the Companies and they will call him for an interview if they have vacancies suitable for him and for your info many Companies in Qatar are finding difficulty to get visas for Filipinos.