Can I enter Vietnam earlier than the arrival date in my visa approval letter?

We are pleased to inform that www.vietnamimmigration.com.au is the E-commercial website for who are LIVING/FROM AUSTRALIA want go to Vietnam. We are not affiliated with the Government. We are offering useful services for helping the Customer to understand visa application, visa processing and visa requirements which is being related to Visa on arrival.
Once you use our services, we have a mission to handle visa applications in Vietnam Immigration Department and provide the legal services to you and on time. You can also obtain Vietnam visa by yourself at Vietnam Embassies in your living country or visit the official website for a lower price. - by www.vietnamimmigration.com.au