内部事务

internal affairs

inside / inner / internal / within / interior

interior / inside (part, section) / internal

ministry / department / section / part / division / troops / board / classifier for works of literature, films, machines etc

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

(political, economic etc) affairs / work / transaction (as in a computer database)

affair / business / matter / to be engaged in / to attend to / by all means