Perhaps you should try some spelling variations:
"serie livres bleu des nations unies ;" » "ser livre bleu des nations unies ;" (Expand Search), "serie claves bleu des nations unies ;" (Expand Search), "six livres bleu des nations unies ;" (Expand Search), "serie livres bleus des nations unies ;" (Expand Search), "serie livres bleu des national unies ;" (Expand Search)
livres blaus » livres bleus (Expand Search)
"Série Livres blaus des Nations Unies ;" » "Série Livres bleus des Nations Unies ;" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("Série Livres blaus des Nations Unies ;") OR ("serie livres bleu des nations unies ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Série Livres blaus des Nations Unies ;\") OR (\"serie livres bleu des nations unies ;\"))".
• Removing quotes may allow a broader search: (( Série Livres blaus des Nations Unies ; ) OR ( serie livres bleu des nations unies ; )).
• Adding a wildcard symbol may retrieve word variants: (("Série Livres blaus des Nations Unies ;") OR ("serie livres bleu des nations unies ;"))*.