Perhaps you should try some spelling variations:
international treaties » international trade, international taxation, international trends
international context » international congress, international conference
mechanical sciences » technical sciences, chemical sciences, mechanical stresses
mechanical science » mechanism science, clinical science, mechanical stretch

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