syntax error: select * from sanpham where idDM = '1' or idDM in (select idDM from danhmuc where cap1 = 1) or idDM in (select idDM from danhmuc where dmCha = 1) or idDM in (select idDM from danhmuc where dmCha in (select idDM from danhmuc where cap1 = 1)) order by capNhat DESC, idSP DESC limit -15,15