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