Perhaps you should try some spelling variations:
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"colloques, congres a conference _ le xvie siecle" » "colloques, congres et conferences _ le xvie siecle" (Expand Search), "colloques, congres di conferenze _ le xvie siecle" (Expand Search), "colloques, congres a conference _ le xvie siecles" (Expand Search), "colloques, congres a conference _ le xviiie siecle" (Expand Search), "colloques, congres a conference _ le xxe siecle" (Expand Search), "colloques, congress _ conference _ le xvie siecle" (Expand Search), "colloques, congres et conference _ le xvie siecle" (Expand Search), "colloque, congres a conference _ le 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 siecle") OR ("colloques, congres a conference _ le xvie siecle"))) or ("colloques, congres _ conference sur le xvie siecle"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("colloques, congres a conference sur le xvie siecle") OR ("colloques, congres a conference _ le xvie siecle"))) OR ("colloques, congres _ conference sur le xvie siecle")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"colloques, congres a conference sur le xvie siecle\") OR (\"colloques, congres a conference _ le xvie siecle\"))) or (\"colloques, congres _ conference sur le xvie siecle\"))".
• Removing quotes may allow a broader search: (((( colloques, congres a conference sur le xvie siecle ) OR ( colloques, congres a conference _ le xvie siecle ))) or ( colloques, congres _ conference sur le xvie siecle )).
• Adding a wildcard symbol may retrieve word variants: (((("colloques, congres a conference sur le xvie siecle") OR ("colloques, congres a conference _ le xvie siecle"))) or ("colloques, congres _ conference sur le xvie siecle"))*.