Collocations for sphere - noun

wider
He wanted to spread his ideas to a wider sphere than the school.

academic, cultural, domestic, economic, military, political, social
His work is little known outside the academic sphere.

private, public

in/within sb''s/the ~
The region is within the Russian sphere of influence.

outside sb''s/the ~
The matter is outside my sphere of responsibility.

~ of

a sphere of activity/influence/life