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

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