Perhaps you should try some spelling variations:
educational supplement » occasional supplement, education supplementary, educational improvement
occasional retirement » personal retirement, additional retirement, occasional punishment
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 ((((educational supplement) OR (occasional retirement))) OR (additional supplement)).
• Adding a wildcard symbol may retrieve word variants: some ((((educational supplement) or (occasional retirement))) or (additional supplement))*.