Perhaps you should try some spelling variations:
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"colloques, congres et conferences sur la xvie siecles" » "colloques, congres a conference sur la xvie siecles" (Expand Search), "colloques, congres et conferences sur la xvie siecle" (Expand Search), "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 siecles" (Expand Search), "colloques, congress et conferences sur la xvie siecles" (Expand Search), "colloques, kongress et conferences sur la xvie siecles" (Expand Search)
"colloques, congres _ conference _ la xvie siecles" » "colloques, congres _ conference _ la xvie siecle" (Expand Search), "colloques, congres _ conference _ la xviiie siecle" (Expand Search), "colloques, congres _ conference _ la xxe siecle" (Expand Search), "colloque, congres _ conference _ la xvie siecles" (Expand Search), "colloques, congress _ conference _ la xvie siecles" (Expand Search), "colloques, kongress _ conference _ 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 et conferences sur la xvie siecles"))) or ("colloques, congres _ conference _ la 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 et conferences sur la xvie siecles"))) OR ("colloques, congres _ conference _ la 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 et conferences sur la xvie siecles\"))) or (\"colloques, congres _ conference _ la xvie siecles\"))".
• Removing quotes may allow a broader search: (((( colloques, congres et conferences sur le xvie siecles ) OR ( colloques, congres et conferences sur la xvie siecles ))) or ( colloques, congres _ conference _ la xvie siecles )).
• Adding a wildcard symbol may retrieve word variants: (((("colloques, congres et conferences sur le xvie siecles") OR ("colloques, congres et conferences sur la xvie siecles"))) or ("colloques, congres _ conference _ la xvie siecles"))*.