Voice recognition with google sppech API

Hello ,

I use google speech API for voice recognition with Asterisk…but I don’t find a good level of performance nor googd results.
So , I ask if there is a way for ameliorating the performance of the API when using it with Asterisk .
If the is nit , can you help me with any suggestions of tools or engines that can be used for voice recognition with Asterisk.
And Thank you for your Help.

Waiting for your suggestions…