I don’t know how you do searching about voice assistant inside hass, but for me finding anything is really hard. Name of Homeassistant service contains ASSISTANT which makes search engines dizzy.
My proposition is Voice Servant.
You can add double quotes around words or sentences on most search engines, so “voice assistant” will often help a bit.
The issue is also that other voice assistants then litter the search results, because Google Assistant, Alexa, Siri all go under voice assistant too.
As you can see the other parties in this field have invented a name for their voice assistant.
Remember to vote for your suggestion! 
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yes i do google tricks and tips, but you know how it is. Better for all search engines is when you don’t leave place for doubts.