Perhaps you should try some spelling variations:
conference sur » conference _ (Expand Search), conference where (Expand Search)
xviiie siecle » xvie siecle (Expand Search)
xvie siecles » xvie siecle (Expand Search)
a conference » di conferenze (Expand Search)
kongress et » kongress der (Expand Search), kongress d (Expand Search)
kongress a » kongress d (Expand Search), congress _ (Expand Search), kongress der (Expand Search)
le xviiie » au xviiie (Expand Search)
sur le » sur la (Expand Search)
congres » congress (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( colloques, congres et conferences sur le xvie siecles ) or ( colloques, congres _ conference sur le xviiie siecle ))) or ((( colloques, kongress et conferences sur le xxe siecle ) or ( colloques, kongress a conference sur le xxe 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 xviiie siecle ))) OR ((( colloques, kongress et conferences sur le xxe siecle ) OR ( colloques, kongress a conference sur le xxe siecle )))).
• Adding a wildcard symbol may retrieve word variants: (((( colloques, congres et conferences sur le xvie siecles ) or ( colloques, congres _ conference sur le xviiie siecle ))) or ((( colloques, kongress et conferences sur le xxe siecle ) or ( colloques, kongress a conference sur le xxe siecle ))))*.