Perhaps you should try some spelling variations:
"diseases supplementary services" » "diseases complementary services", "disease complementary services", "issues supplementary services", "diseases supplementary exercises"
"selected supplementary materials" » "required supplementary materials"

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