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