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