Perhaps you should try some spelling variations:
"oecd health screening papers" » "oecd health spending papers", "oecd health screening paper", "oecd health screening panels", "oecd health screening markers"
"oecd health during papers" » "oecd health using papers", "oecd health turing's papers", "oecd health working papers"

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: (("oecd health screening papers") OR ("oecd health during papers")).
• Removing quotes may allow a broader search: (( oecd health screening papers ) or ( oecd health during papers )).
• Adding a wildcard symbol may retrieve word variants: (("oecd health screening papers") or ("oecd health during papers"))*.