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

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 context) OR (international congress)))) 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 context) or (international congress)))) for mechanical sciences, courses and (lectures OR lecture)".
• Adding a wildcard symbol may retrieve word variants: ((international centre) or (((international context) or (international congress)))) for mechanical sciences, courses and (lectures OR lecture)*.