Perhaps you should try some spelling variations:
astronomique internationale » assyriologique internationale, autonomie internationaler, astronomy international
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: observations astronomical union / union ((astronomique internationale) OR (economique internationale)).
• Adding a wildcard symbol may retrieve word variants: observations astronomical union / union ((astronomique internationale) or (economique internationale))*.