NoResult from the query of semantic Quran dataset

[halagamal]

Hi ,
i'm trying to work on dataset and make queries on it but when i run the queries ,no thing return :(
Here is my code:
import rdflib
from rdflib import Graph
g = Graph()
g.parse('http://datahub.io/dataset/semanticquran');
query = """
PREFIX dc: http://purl.org/dc/elements/1.1/
PREFIX foaf: http://xmlns.com/foaf/0.1/
PREFIX olia-ar: http://purl.org/olia/arabic_khoja.owl#
PREFIX dcterms: http://purl.org/dc/terms/
PREFIX rdfs: http://www.w3.org/2000/01/rdf-schema#
PREFIX owl: http://www.w3.org/2002/07/owl#
PREFIX xsd: http://www.w3.org/2001/XMLSchema#
PREFIX lexvo: http://lexvo.org/id/iso639-3/
PREFIX rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
PREFIX gold: http://purl.org/linguistics/gold/
PREFIX skos: http://www.w3.org/2004/02/skos/core#
PREFIX qvoc: http://www.nlp2rdf.org/quranvocab#
SELECT DISTINCT ?wordText ?pos
WHERE
{ ?wordPart rdf:type qvoc:LexicalItem .
?wordPart gold:Root "ktb" .
?wordPart dcterms:isPartOf ?word .
?wordPart gold:PartOfSpeechProperty ?pos .
?word rdf:type qvoc:Word .
?word skos:prefLabel ?wordText
}
"""

for row in g.query(query):
print row

I have tried it also on the endpoint and also no thing returns
Any Help??