Perhaps you should try some spelling variations:
international congress » international conference
international centre » international theatre, international context, international case
mechanism sciences » mechanisms science, mechanical sciences, mechanics science

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

• If you are trying to use Boolean operators, they must be ALL CAPS: "((international centre) OR (international congress)) for ((mechanism sciences) OR (mechanism science)), courses AND (lectures" or lecture").
• Removing quotes may allow a broader search: ((international centre) or (international congress)) for ((mechanism sciences) or (mechanism science)), courses and (lectures or lecture ).
• Adding a wildcard symbol may retrieve word variants: "((international centre) or (international congress)) for ((mechanism sciences) or (mechanism science)), courses and (lectures" or lecture")*.