Perhaps you should try some spelling variations:
international treaties » international trade, international taxation, international trends
international congress » international conference
international theatre » international trade, international test, international taxation
international centre » international context, international case, international capital
mechanical sciences » technical sciences, chemical sciences, mechanical stresses
mechanical science » mechanism science, clinical science, mechanical stretch
lectures » lecture

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