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

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: "((international theatre) OR (((international context) OR (international congress)))) for ((mechanical sciences) OR (mechanical science)), courses AND (lectures" OR lecture").
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• Adding a wildcard symbol may retrieve word variants: "((international theatre) or (((international context) or (international congress)))) for ((mechanical sciences) or (mechanical science)), courses and (lectures" OR lecture")*.