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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"luxembourg outcome study\") OR (\"luxembourg outcome studies\"))".
• Removing quotes may allow a broader search: (( luxembourg outcome study ) OR ( luxembourg outcome studies )).
• Adding a wildcard symbol may retrieve word variants: (("luxembourg outcome study") OR ("luxembourg outcome studies"))*.