Perhaps you should try some spelling variations:
international context » international congress
international centre » international theatre, international case, international capital
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 centre) OR (((international context) OR (international conference)))) for technical sciences, courses AND (lectures" OR lecture").
• Removing quotes may allow a broader search: ((international centre) or (((international context) or (international conference)))) for technical sciences, courses and (lectures OR lecture ).
• Adding a wildcard symbol may retrieve word variants: "((international centre) or (((international context) or (international conference)))) for technical sciences, courses and (lectures" OR lecture")*.