Perhaps you should try some spelling variations:
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"colloques, kongress et conferences sur le xxe siecle" » "colloques, kongress der conferences sur le xxe siecle" (Expand Search), "colloques, congres et conferences sur le xxe siecle" (Expand Search), "colloques, kongress d conferences sur le xxe siecle" (Expand Search), "colloques, kongress et conferences sur la xxe siecle" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((((("colloques, congres a conference sur le xvie siecles") OR ("colloques, congres a conference where le xvie siecles"))) or ("colloques, congres _ conference sur le xvie siecles"))) or ("colloques, kongress et conferences sur le xxe siecle"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("colloques, congres a conference sur le xvie siecles") OR ("colloques, congres a conference where le xvie siecles"))) OR ("colloques, congres _ conference sur le xvie siecles"))) OR ("colloques, kongress et conferences sur le xxe siecle")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"colloques, congres a conference sur le xvie siecles\") OR (\"colloques, congres a conference where le xvie siecles\"))) or (\"colloques, congres _ conference sur le xvie siecles\"))) or (\"colloques, kongress et conferences sur le xxe siecle\"))".
• Removing quotes may allow a broader search: (((((( colloques, congres a conference sur le xvie siecles ) OR ( colloques, congres a conference where le xvie siecles ))) or ( colloques, congres _ conference sur le xvie siecles ))) or ( colloques, kongress et conferences sur le xxe siecle )).
• Adding a wildcard symbol may retrieve word variants: (((((("colloques, congres a conference sur le xvie siecles") OR ("colloques, congres a conference where le xvie siecles"))) or ("colloques, congres _ conference sur le xvie siecles"))) or ("colloques, kongress et conferences sur le xxe siecle"))*.