def get_search_results(self, request, queryset, search_term):
        # Apply keyword searches.
        def construct_search(field_name):
            if field_name.startswith('^'):
                return "%s__istartswith" % field_name[1:]
            elif field_name.startswith('='):
                return "%s__iexact" % field_name[1:]
            elif field_name.startswith('@'):
                return "%s__search" % field_name[1:]
            else:
                return "%s__icontains" % field_name

        use_distinct = False
        if self.search_fields and search_term:
            orm_lookups = [construct_search(str(search_field))
                           for search_field in self.search_fields]
            for bit in search_term.split():
                or_queries = [models.Q(**{orm_lookup: bit})
                              for orm_lookup in orm_lookups]
                queryset = queryset.filter(reduce(operator.or_, or_queries))
            if not use_distinct:
                for search_spec in orm_lookups:
                    if lookup_needs_distinct(self.opts, search_spec):
                        use_distinct = True
                        break

        return queryset, use_distinct
Returns a tuple containing a queryset to implement the search,
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/contrib/admin/options.py/ModelAdmin.get_search_results