Perhaps you should try some spelling variations:
international context » international congress, international conference
technical sciences » medical sciences, chemical sciences, technical advances
mechanical science » mechanism science, mechanical stretch, mechanical efficiency
clinical science » political science, clinical evidence, ecological science
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 trade) OR (international context)) for ((technical sciences) OR (((mechanical science) OR (clinical science)))), courses AND lectures.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((international trade) or (international context)) for ((technical sciences) or (((mechanical science) OR (clinical science)))), courses and lectures".
• Adding a wildcard symbol may retrieve word variants: ((international trade) or (international context)) for ((technical sciences) or (((mechanical science) OR (clinical science)))), courses and lectures*.