Perhaps you should try some spelling variations:
international congress » international conference
international theatre » international treaties, international trade, international test
international context » international conference
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 theatre) OR (((international context) OR (international congress)))) for mechanical science, courses AND lectures.
• Adding a wildcard symbol may retrieve word variants: ((international theatre) or (((international context) or (international congress)))) for mechanical science, courses and lectures*.