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