Perhaps you should try some spelling variations:
"luxembourg outcome study" » "luxembourg income study", "luxembourg cote study", "luxembourg future study", "luxembourg outcome studies"
"luxembourg october studies" » "luxembourg november studies", "luxembourg september studies"

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: (("luxembourg outcome study") OR ("luxembourg october studies")).
• Removing quotes may allow a broader search: (( luxembourg outcome study ) or ( luxembourg october studies )).
• Adding a wildcard symbol may retrieve word variants: (("luxembourg outcome study") or ("luxembourg october studies"))*.