Perhaps you should try some spelling variations:
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• Performing a fuzzy search may retrieve terms with similar spellings: (("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 _ le xvie siecle") OR ("colloques, congres _ conference sur le xvie siecle")).
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• Adding a wildcard symbol may retrieve word variants: (("colloques, congres a conference _ le xvie siecle") or ("colloques, congres _ conference sur le xvie siecle"))*.