He is directly hired from Philippines. I was just wondering if he could seek intervention from the labor department to give him the same opportunity to go to Qatar just like before he was hired by his present employer.

Actually, the employer initially allows him to come back and work with them ( and make a contract with unlimited period) after his vacation provided he pays his own ticket.

I haven't known any company here in Qatar who refuses to give their employees round trip ticket during his vacation after two years of service.