Perhaps you should try some spelling variations:
cleaner supplementary » cortex supplementary, aged supplementary, annex supplementary
eleven supplementary » selected supplementary, present supplementary, led supplementary
level supplementary » several supplementary, severi supplementary, led supplementary

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: ((cleaner supplementary) OR (((eleven supplementary) OR (level supplementary)))) series.
• Adding a wildcard symbol may retrieve word variants: ((cleaner supplementary) or (((eleven supplementary) or (level supplementary)))) series*.