syntax error: select * from sanpham where idDM = '9' or idDM in (select idDM from danhmuc where cap1 = 9) or idDM in (select idDM from danhmuc where dmCha = 9) or idDM in (select idDM from danhmuc where dmCha in (select idDM from danhmuc where cap1 = 9)) order by capNhat DESC, idSP DESC limit -15,15