Perhaps you should try some spelling variations:
international congress » international conference
international centre » international theatre, international context, international capital
mechanical sciences » mechanical science, technical sciences, mechanical stresses
international case » international capital, international context

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((international centre) OR (international case))) OR (international congress)) for mechanical sciences, courses AND (lectures\" or lecture\")".
• Removing quotes may allow a broader search: ((((international centre) OR (international case))) OR (international congress)) for mechanical sciences, courses AND (lectures or lecture ).
• Adding a wildcard symbol may retrieve word variants: "((((international centre) OR (international case))) OR (international congress)) for mechanical sciences, courses AND (lectures" or lecture")*.