Perhaps you should try some spelling variations:
michael johnston » michael johnson, michael boston, michael jackson
richard johnston » richard jackson, richard weston, richard john
richard johnson » richard jackson

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: ((michael johnston) OR (((birchall johnston) OR (((richard johnston) OR (richard johnson)))))) (actor).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((michael johnston) or (((birchall johnston) or (((richard johnston) OR (richard johnson)))))) (actor)".
• Adding a wildcard symbol may retrieve word variants: ((michael johnston) or (((birchall johnston) or (((richard johnston) OR (richard johnson)))))) (actor)*.