Unless you're flying out business on Vietnam airlines, I don't think you qualify for lounge access. Access is always based on the outbound flight except for a a few "arrival"lounges.
That said, on your return (if you're flying Business with AC), they'll have a contract lounge. It might actually not be a star alliance one.
Flying home from Melbourne, United sent me to the Cathay lounge, when there were a Star Alliance Air NZ and Singapore lounges available.
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