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