Hi there! No vaccines should be given before 6 weeks, but I'd wait till 8 weeks since it will make the vaccine more effective, and your chi will be a little older and stronger in case of vaccine reaction. Let your veterinarian map out the vaccine schedule, but it never hurts to suggest that you space them out so that no 2 vaccines are given on the same day.
This is protocol that we use on most small breed puppies:
DHPP 8 weeks
DHPP 12 weeks
Bordatella 13 weeks
DHPP 16 weeks
Rabies 17 weeks
This way if there is a vaccine reaction, we know which booster caused it, and the body has at least a week to recover from the last, since vaccinating "boosters" the bodie's immune system, it's a little stressful on their body.
Good luck! Don't forget to bring a fresh stool sample to your vet so they can check for internal parasites. If you can't get it within 1hr of the appointment, they are good for up to 4 hours in the refridgerator.
-Nate