Perhaps you should try some spelling variations:
politique internationale » policy international
astronomy international » autonomy international, economy international, astronomy observational
international economic » international economics

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 economic) OR (observations astronomical)) union/union ((astronomy international) OR (politique internationale)).
• Adding a wildcard symbol may retrieve word variants: ((international economic) or (observations astronomical)) union/union ((astronomy international) or (politique internationale))*.