Job Offer in Vietnam What is Best option for my Mongolian Partner

I(US Citizen) am due to enter Vietnam this July to begin my two year contract as an Elementary School Teacher at an International School in Hanoi. My same-sex partner (Mongolian citizen) and I currently live in Mongolia, but want to make the shift and try something new. However, my employer can't sponsor her dependent visa under my work visa, because Vietnam currently does not have any legal protections for same-sex partners. My question is, what is the best option for us? I would prefer to get her a 3 month visa in order to avoid monthly visa runs for 2 years. However, I heard visa policies may change starting July 1st. Please give me some suggestions and options so that we can be together during my two year contract in Vietnam
Thanks in advanced!