Visa situation for 2 people entering Vietnam twice in 7 days

Hi there, I am a British passport holder and my friend is an Malaysian passport holder. We are planning a trip to go to Vietnam (Ho chi Minh city), then travel to Cambodia and Laos before flying to Hanoi (Vietnam) which is where we finish our tour. I know we do not require a visa up to a 15 days stay in Vietnam but can you tell me if it will be okay for us to entry Vietnam twice within 7 days please? Many thanks.