Air China offers very very cheap business class flights from Oslo via Stockholm (operated by SAS) & Peking to Bangkok. Can be booked directly at airchina.com. Good availability until August 2020. Minimum stay 6 day, max. 3 month. Free stopover in PEK possible.
Source: My site Travel-Dealz.eu
Bangkok: €475/4,841 NOK Business Class From Oslo With Air China