No, it doesn’t 

The required documents can have less than 12 months remaining, but must be valid at the time of applying to join Timo  

Yes, As long as your Spouse visa shows you are allowed to reside in Vietnam for at least 12 months.

No, it does not. The required documents only need to show that you are permitted to stay in Vietnam for a period of 12 months or above. 

However, these documents must be valid at the time of applying to join Timo

Temporary resident confirmation is a confirmation letter issued by local police to confirm your residence status at a local address where you temporarily live in Vietnam. A letter from the employer is not sufficient in this case.