Perhaps you should try some spelling variations:
"international pandemic" » "international academic", "international academics", "international panel"
"international epidemic" » "international academic", "international economic", "international evidence"
"national academy" » "national academic"

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: (("national academy") OR ((("international pandemic") OR ("international epidemic")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"national academy\") or (((\"international pandemic\") OR (\"international epidemic\"))))".
• Removing quotes may allow a broader search: (( national academy ) or ((( international pandemic ) OR ( international epidemic )))).
• Adding a wildcard symbol may retrieve word variants: (("national academy") or ((("international pandemic") OR ("international epidemic"))))*.