The reason why so many Americans are confused by the symbols ʌ and ə is they are just ONE vowel phoneme in General American accents.

(Note: many Americans feel they have their unstressed /ɪ/ rather than /ə/ in some of the words shown from dictionaries in the video. But that still doesn't mean a distinct /ʌ/.)

Resources using a single /ə/ phoneme and no /ʌ/:
https://www.merriam-webster.com/
https://www.amazon.com/Merriam-Webste...
https://www.lexico.com/en/
https://www.amazon.com/Oxford-Diction...
https://www.amazon.com/Routledge-Dict...
https://www.amazon.com/American-Engli...
https://www.amazon.com/American-Engli...

I'll Be Back from Hamilton
   • Musical Theatre Coach Reacts (Jonatha...  

Request a reasonably priced paperback edition of the Routledge Dictionary of Pronunciation from the publisher, Taylor & Francis: amy.laurens at tandf.co.uk