Perhaps you should try some spelling variations:
"luxembourg context studies" » "luxembourg contextual studies", "luxembourg comment studies", "luxembourg court studies", "luxembourg contexts studies", "luxembourg contents studies", "luxembourg concept studies"
"luxembourg cote study" » "luxembourg jose study", "luxembourg income study", "luxembourg nicole study", "luxembourg code study", "luxembourg note study", "luxembourg route study"
"luxembourg country studies" » "luxembourg industry studies"
"luxembourg city studies" » "luxembourg society studies", "luxembourg security studies", "luxembourg toxicity 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 cote study") OR ((("luxembourg context studies") OR ((("luxembourg country studies") OR ("luxembourg city studies")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"luxembourg cote study\") or (((\"luxembourg context studies\") or (((\"luxembourg country studies\") OR (\"luxembourg city studies\"))))))".
• Removing quotes may allow a broader search: (( luxembourg cote study ) or ((( luxembourg context studies ) or ((( luxembourg country studies ) OR ( luxembourg city studies )))))).
• Adding a wildcard symbol may retrieve word variants: (("luxembourg cote study") or ((("luxembourg context studies") or ((("luxembourg country studies") OR ("luxembourg city studies"))))))*.