class Videos(models.Model):
    title = models.CharField(max_length=45)

class TimelinePoints(models.Model):
    description = models.CharField(max_length=45)
    videos_id = models.ForeignKey('Videos', models.DO_NOTHING, db_column='Videos_id')
    # ... Otros campos sin importancia

videos = Videos.objects.filter(Q(title__icontains = string_ingresado) | Q(timelinepoints__description__icontains = string_ingresado))

timeline_points = TimelinePoints.objects.filter(description__icontains = string_ingresado).only('description')