Perhaps you should try some spelling variations:
trades unionist » trades unionism, trades unions, trade unionism
tom stephenson » rob stephenson, wm stephenson, thomas stephenson
s.m stephenson » wm stephenson, l stephenson, _ stephenson

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tom stephenson) OR (s.m stephenson)) (trades unionist).
• Adding a wildcard symbol may retrieve word variants: ((tom stephenson) or (s.m stephenson)) (trades unionist)*.