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

Try widening your search to All Fields.

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