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 xvie siecle" (Expand Search), "colloques, congres _ conference sur le xviiie siecle" (Expand Search), "colloques, congres _ conference sur le xxe siecle" (Expand Search), "colloques, congres _ conference sur la xvie siecles" (Expand Search)
"colloque, congres _ conference sur le xvie siecles" » "colloque, congres _ conference _ le xvie siecles" (Expand Search), "colloque, congres _ conference where le xvie siecles" (Expand Search), "colloque, congres _ conference sur le xvie siecle" (Expand Search), "colloque, congres _ conference sur le xviiie siecle" (Expand Search), "colloque, congres _ conference sur le xxe siecle" (Expand Search), "colloque, congres _ conference sur la xvie siecles" (Expand Search)

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