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