I am after a L visa to quindao i plan to gain multiple entry over 6 or 12 months

my husband works there and i wish to go on 3rd January through to 3rd feb but there could be a chance i will need to stay another couple of weeks after the 30 days, do i have to leave the country and return ? maybe go to HK for a couple of days or day? will this allow me another 30 days? I do not wish to fly back to nz just to reenter again.