Perhaps you should try some spelling variations:
michael johnston » michael johnson, birchall johnston, michael johns
richard johnston » richard johnson, richard jackson, richard weston
michael boston » michael bothe, michael boylan

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