Voice control

Can I control the device via voice in Vietnamese?
I use blynk, ifttt and webhook

The current version of Blynk doesn’t support direct voice control, but if you have a smart speaker such as Alexa or Google Home then voice control is possible.
I’m not sure what the Alexa/Google support for Vietnamese language is.

Pete.

How can I show the temperature via google assistant

I’m not sure, I’m an Alexa guy myself, but try searching for “Sinric”.

Pete.

Alexa and Google home integrations available only for commercial clients for now. However, I saw here somewhere that somebody implemented it by his own.