Compounds:

HSK5000 A1+A2+B1

HSK5000 B2 + C1
3273 (verb: to act jointly, to form a partnership) They formed a partnership and bought this company. Sie schlossen sich zusammen, um das Unternehmen zu kaufen. Họ hợp tác để mua công ty. Họ hợp_tác để mua công_ty . They \| cooperate \| to \| buy \| company.