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