Perhaps you should try some spelling variations:
international treaties » international trade, international taxation, international trends
international context » international congress, international conference
technical sciences » medical sciences, chemical sciences, technical advances

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 treaties) OR (international context)) for technical sciences, courses AND lecture.
• Adding a wildcard symbol may retrieve word variants: ((international treaties) or (international context)) for technical sciences, courses and lecture*.