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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("colloque, congres a conference where le xvie siecle") OR ("colloque, congres a conference where le 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 where le xvie siecle") OR ("colloque, congres a conference where le 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 where le xvie siecle\") OR (\"colloque, congres a conference where le xvie siecles\"))) or (\"colloque, congres et conferences sur le xvie siecle\"))".
• Removing quotes may allow a broader search: (((( colloque, congres a conference where le xvie siecle ) OR ( colloque, congres a conference where le xvie siecles ))) or ( colloque, congres et conferences sur le xvie siecle )).
• Adding a wildcard symbol may retrieve word variants: (((("colloque, congres a conference where le xvie siecle") OR ("colloque, congres a conference where le xvie siecles"))) or ("colloque, congres et conferences sur le xvie siecle"))*.