How to make a search engine for my comments - django

Question

I am trying to make a search engine through the posted comments. The goal is to search the comments as easiest as possible. See below the architecture of the program:
views.py
class ComentarioListar (LoginRequiredMixin,ListView):
login_url='/'
redirect_field_name='redirigido'
model = Comentario
template_name = 'home/comentario_listar.html'
class busqueda (ListView):
model=Comentario
template_name='home/search.html'
def get_queryset(self):
qs=Comentario.objects.filter()
keywords=self.request.GET.get('q')
if keywords:
query=SearchQuery(keywords)
vector=SearchVector('titulo')
qs=qs.annotate(search=vector).filter(search=query)
qs=qs.annotate(rank=SearchRank(vector,query)).order_by('-rank')
return render(request, 'home/search.html', {'qs':qs} )
urls.py
urlpatterns = [
url(r'^listar$', ComentarioListar.as_view(), name="listar"),
url(r'^search$',busqueda, name="search"),]
models.py
class Comentario (models.Model):
titulo = models.CharField(max_length=50)
texto = models.CharField(max_length=200)
autor = models.ForeignKey (Perfil, null=True, blank=True, on_delete=models.CASCADE)
fecha_publicacion = models.DateTimeField(auto_now_add=True)
tag = models.ManyToManyField(Tags, blank=True)
def __str__(self):
return (self.titulo)
cometario_listar.html (where I have created the search button)
<form id="searchform" action="search/" method="GET" accept-charset="utf-8">
<button class="searchbutton" type="submit">
<i class="fa fa-search"></i>
</button>
<input class="searchfield" id="searchbox" name="q" type="text" placeholder="Search" id="busqueda">
</form>
{% endblock %}
search.html
{% extends 'base/base.html' %}
{% block content %}
<table class="table table-striped">
<thead class="thead-default">
<tr>
<td>Titulo</td>
<td>Descripcion</td>
<td>Autor</td>
<td>Fecha de publicación</td>
<td>Etiqueta</td>
</thead>
<tbody>
{% if qs %}
{% for comentario in object_list %}
<tr>
<td>{{comentario.titulo}}</td>
<td>{{comentario.texto}}</td>
<td>{{comentario.autor}}</td>
<td>{{comentario.fecha_publicacion}}</td>
{% for tag in comentario.tag.all %}
<td>{{ tag.nombre }}</td>
{% endfor %}
{% endfor %}
</tr>
{% else %}
<h1>No hay registros de comentarios</h1>
{% endif %}
</tbody>
</table>
The problem is that it does not work. 'http://127.0.0.1:8000/home/search/?q=nueva' appears correctly, but it does not make any filtering. Is it possible to use the same .html file (comentario_listar.html) to make the search?
thank you in advance for your help.