Hi, I’m Lien on behalf of the team at BitcoinVN – Vietnam’s oldest and longest-running cryptocurrency exchange (founded in 2014).
We’d like to share some recent infrastructure upgrades that have significantly improved key aspects of our ZEC-related services:
Swap speed: Transactions now settle within seconds instead of minutes.
Larger swap capacity: The maximum swap size has increased from approximately $1,000 to $50,000 per transaction.
Our platform also provides a direct on- and offramp for ZEC in Vietnam:
Please note: Shielded Zcash transactions are not yet supported. However, we’re monitoring demand and are open to allocating engineering resources should sufficient interest arise.
Special thanks to Pacu for his technical guidance, and to Tom Howard for his ongoing support throughout the upgrade process.
We appreciate the Zcash community and look forward to continuing to expand our service offerings as resources allow. 
Full update here: https://bitcoinvn.io/news/zcash-infrastructure-upgrades/