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 where le xvie siecles" (Expand Search), "colloques, congres _ conference sur le xviiie siecle" (Expand Search), "colloques, congres _ conference sur le xxe siecle" (Expand Search), "colloques, congres _ conference sur le xviiie siecles" (Expand Search), "colloques, congres _ conference sur le xxe siecles" (Expand Search), "colloque, congres _ conference sur le xvie siecles" (Expand Search)
"colloques, congres et conferences sur la xvie siecle" » "colloques, congres et conferences sur la xviiie siecle" (Expand Search), "colloques, congres et conferences sur la xxe siecle" (Expand Search), "colloque, congres et conferences sur la xvie 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 et conferences sur la xvie siecle"))) or ("colloques, congres _ conference sur le xvie siecles"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("colloques, congres a conference sur le xvie siecles") OR ("colloques, congres et conferences sur la xvie siecle"))) OR ("colloques, congres _ conference sur le xvie siecles")).
• Removing quotes may allow a broader search: (((( colloques, congres a conference sur le xvie siecles ) or ( colloques, congres et conferences sur la xvie siecle ))) or ( colloques, congres _ conference sur le xvie siecles )).
• Adding a wildcard symbol may retrieve word variants: (((("colloques, congres a conference sur le xvie siecles") or ("colloques, congres et conferences sur la xvie siecle"))) or ("colloques, congres _ conference sur le xvie siecles"))*.