Perhaps you should try some spelling variations:
"colloque, congres a conference sur le xvie siecle" » "colloque, congres a 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 a conference sur le xviiie siecle" (Expand Search), "colloque, congres a conference sur le xxe siecle" (Expand Search), "colloque, congress _ conference sur le xvie siecle" (Expand Search)
"colloque, congres a conference sur la xvie siecles" » "colloque, congres a conference where la xvie siecles" (Expand Search), "colloque, congres _ conference sur la xvie siecles" (Expand Search), "colloque, congres di conferenze sur la xvie siecles" (Expand Search), "colloque, congres a conference sur la xviiie siecle" (Expand Search), "colloque, congres a conference sur la xxe siecle" (Expand Search), "colloque, congres a conference sur la xviiie siecles" (Expand Search), "colloque, congres a conference sur la xxe siecles" (Expand Search), "colloque, congress _ conference sur la xvie siecles" (Expand Search)
"colloque, congres et conferences sur le xvie siecle" » "colloque, congres _ conference sur le xvie siecle" (Expand Search), "colloque, congres et conferences sur le xviiie siecle" (Expand Search), "colloque, congres et conferences sur le xxe siecle" (Expand Search)
"colloque, congres a conference _ le xvie siecle" » "colloque, congres _ conference _ le xvie siecle" (Expand Search), "colloque, congres di conferenze _ le xvie siecle" (Expand Search), "colloque, congres a conference _ le xviiie siecle" (Expand Search), "colloque, congres a conference _ le xxe siecle" (Expand Search), "colloque, congress _ conference _ le xvie 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 _ le xvie siecle"))) or ("colloque, congres a conference sur la xvie siecles"))) or ("colloque, congres et conferences 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 _ le xvie siecle"))) OR ("colloque, congres a conference sur la xvie siecles"))) OR ("colloque, congres et conferences 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 _ le xvie siecle\"))) or (\"colloque, congres a conference sur la xvie siecles\"))) or (\"colloque, congres et conferences sur le xvie siecle\"))".
• Removing quotes may allow a broader search: (((((( colloque, congres a conference sur le xvie siecle ) OR ( colloque, congres a conference _ le xvie siecle ))) or ( colloque, congres a conference sur la xvie siecles ))) or ( colloque, congres et conferences 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 _ le xvie siecle"))) or ("colloque, congres a conference sur la xvie siecles"))) or ("colloque, congres et conferences sur le xvie siecle"))*.