Perhaps you should try some spelling variations:
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"colloque, congres et conference sur le xvie siecle" » "colloque, congres et conferences sur le xvie siecle" (Expand Search), "colloque, congres et conference _ le xvie siecle" (Expand Search), "colloque, congres et conference where le xvie siecle" (Expand Search), "colloque, congres _ conference sur le xvie siecle" (Expand Search), "colloque, congres di conferenze sur le xvie siecle" (Expand Search), "colloque, congres et conference sur le xvie siecles" (Expand Search), "colloque, congres et conference sur le xviiie siecle" (Expand Search), "colloque, congres et conference sur le xxe siecle" (Expand Search)

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