syntax error: select * from sanpham where (idDM =  or idDM2 =  
        or idDM in (select idDM from danhmuc where cap1 = ) or idDM2 in (select idDM from danhmuc where cap1 = )
        or idDM in (select idDM from danhmuc where dmCha = ) or idDM2 in (select idDM from danhmuc where dmCha = ) 
        or idDM in (select idDM from danhmuc where dmCha in (select idDM from danhmuc where cap1 = )) or idDM2 in (select idDM from danhmuc where dmCha in (select idDM from danhmuc where cap1 = ))
        	)
         order by vitri, idSP DESC