syntax error: select * from sanpham where idDM = 'Hang' or idDM in (select idDM from danhmuc where cap1 = Hang) or idDM in (select idDM from danhmuc where dmCha = Hang) or idDM in (select idDM from danhmuc where dmCha in (select idDM from danhmuc where cap1 = Hang)) order by vitri, idSP DESC