python - How to filter various fields -

i have piece of code @ views, intend filtering various fields in database model called orderitem.

here code:

def search_form(request):      if 'q' in request.get , request.get['q']:         x = request.get['q']         q = x.title()          print q          x = request.get['certification_type']         print x          items = orderitem.objects.filter(q(order_type__iexact=x , order_type__iexact=q) | q(certification_type__iexact=x , certification_type__iexact=q) | q(item__iexact=x , item__iexact=q)          | q(certification_no__iexact=x , certification_no__iexact=q) | q(client__user__email__iexact=x , client__user__email__iexact=q) | q(client__phone_number__iexact=x , client__phone_number__iexact=q)          | q(created_on__icontains=x , created_on__icontains=q))           x in items:             q in items:                 print items             return render(request, 'i/search_results.html', {'items':items, 'query':q})     else:         return render(request, 'i/search_form.html', {'error':true}) 

but if try find items under certification_type, empty list [] @ console. don't know missing