QHelpSearchEngine cannot read results

class Help(QMainWindow):

def __init__(self , parent = None):
 super(Help , self).__init__(parent)

 ui_file = QFile('Gui/general.ui')
 ui_file.open(QFile.ReadOnly)

 loader = QUiLoader()
 self.window = loader.load(ui_file)
 ui_file.close()

 # Store parent
 self.parent = parent

 # Build help engine
 self.helpEngine = QHelpEngine('/home/stefano/PycharmProjects/designtool/help/help.qhc')
 self.helpEngine.setupData()
 self.helpEngine.searchEngine().reindexDocumentation()

 #self.searchEngine = self.helpEngine.searchEngine()
 self.searchEngine = QHelpSearchEngine(self.helpEngine , self)
 self.searchEngine.reindexDocumentation()

# ...

 # When search button is clicked start search
 self.searchEngine.queryWidget().search.connect(self.searchInit)

 # When searching is finished, retrieve results
 self.searchEngine.searchingFinished.connect(self.searchRetrieveResults)

def searchInit(self):
        # User input
        #self.param = self.searchEngine.queryWidget().searchInput()

        #pprint.pprint(self.param)

        # Search for results
        # search = self.searchEngine.resultsWidget().search(param)
        #self.searchEngine.search(self.param)

        #pprint.pprint('Searched for ' + self.searchEngine.searchInput())

        q = self.searchEngine.queryWidget().query()
        self.searchEngine.search(q);

def searchRetrieveResults(self):
        # Widgets
        queryWidget = self.searchEngine.queryWidget()
        resultsWidget = self.searchEngine.resultWidget()

        count = self.searchEngine.searchResultCount()

        pprint.pprint('Results found: ' + str(count))

        results = self.searchEngine.searchResults(0 , count)

        pprint.pprint(results)