Perhaps you should try some spelling variations:
astronomique internationale » assyriologique internationale, autonomie internationaler, astronomy international
international astronomical » international economic
economique internationale » economics international, economy international, politique internationale

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 astronomical) OR (international economics))) OR (observations astronomical)) union/union ((astronomique internationale) OR (economique internationale)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((international astronomical) OR (international economics))) or (observations astronomical)) union/union ((astronomique internationale) or (economique internationale))".
• Adding a wildcard symbol may retrieve word variants: ((((international astronomical) OR (international economics))) or (observations astronomical)) union/union ((astronomique internationale) or (economique internationale))*.