Perhaps you should try some spelling variations:
educational supplement » education supplementary, educational improvement, educational equipment
occasional supplement » occasional punishment, occasional retirement
additional supplement » additional settlement, nutritional supplement, additional supplies

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: some ((((occasional supplement) OR (educational supplement))) OR (additional supplement)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "some ((((occasional supplement) OR (educational supplement))) or (additional supplement))".
• Adding a wildcard symbol may retrieve word variants: some ((((occasional supplement) OR (educational supplement))) or (additional supplement))*.