Why start with a free CRM
Most Vietnamese small businesses do not need a large sales system. They need to stop losing customers between conversations. A quotation goes out and nobody chases it. A customer asks a question on Zalo and the reply waits until the next day. The details of a good account live on one salesperson's phone.
A free CRM is the lowest-risk way to fix that. You put your customers and open deals in one place, give each one a next step, and find out whether your team will actually use it, all before spending anything. If the habit takes hold, upgrading is an easy decision. If it does not, you have lost nothing.

