Perhaps you should try some spelling variations:
"luxembourg outcome study" » "luxembourg cote study", "luxembourg future study", "luxembourg nicole 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 income study") OR ("luxembourg outcome study"))) OR ("luxembourg october studies")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"luxembourg income study\") OR (\"luxembourg outcome study\"))) or (\"luxembourg october studies\"))".
• Removing quotes may allow a broader search: (((( luxembourg income study ) OR ( luxembourg outcome study ))) or ( luxembourg october studies )).
• Adding a wildcard symbol may retrieve word variants: (((("luxembourg income study") OR ("luxembourg outcome study"))) or ("luxembourg october studies"))*.