The Vietnamese word "neo đơn" refers to a situation, especially in the context of a family or group, that is short of manpower or is small in size. It can describe a family that has few members or is not able to operate at full capacity due to a lack of people.
In summary, "neo đơn" is a useful word to describe situations where there is a lack of people, particularly in family or group settings. It conveys the idea of being small in size or limited in capacity.