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