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

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 treaties) OR (((international context) OR (international congress)))) for ((mechanical sciences) OR (mechanical science)), courses AND (lectures\" OR lecture\")".
• Removing quotes may allow a broader search: ((international treaties) OR (((international context) OR (international congress)))) for ((mechanical sciences) OR (mechanical science)), courses AND (lectures OR lecture ).
• Adding a wildcard symbol may retrieve word variants: "((international treaties) OR (((international context) OR (international congress)))) for ((mechanical sciences) OR (mechanical science)), courses AND (lectures" OR lecture")*.