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