Perhaps you should try some spelling variations:
"selected supplementary materials" » "selected supplementary material", "required supplementary materials"
"aged supplementary services" » "aged supplementary exercises", "added supplementary services", "used supplementary services", "add supplementary services"

Try widening your search to All Fields.

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: (("aged supplementary services") OR ("selected supplementary materials")).
• Removing quotes may allow a broader search: (( aged supplementary services ) or ( selected supplementary materials )).
• Adding a wildcard symbol may retrieve word variants: (("aged supplementary services") or ("selected supplementary materials"))*.