From Wiktionary, the free dictionary
Sino-Vietnamese word from 鬼 (“ghost; demon”) and 使 (“envoy; messenger”).
quỷ sứ
- (occult, mythology) a type of errand demon in the world of the dead
nghịch như quỷ (sứ)- (of a child) very mischievous
Nhà tôi có hai thằng quỷ sứ.- There are two little "demon boys" in my family.