Perhaps you should try some spelling variations:
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"colloques, congres _ conference sur le xvie siecles" » "colloques, congres _ conference _ le xvie siecles" (Expand Search), "colloques, congres _ conference sur le xvie siecle" (Expand Search), "colloques, congres _ conference sur le xxe siecle" (Expand Search), "colloques, congres _ conference sur la xvie siecles" (Expand Search), "colloques, kongress _ conference sur le xvie siecles" (Expand Search)

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