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