Perhaps you should try some spelling variations:
"international economic union / union assyriologique internationale" » "international economic union / union neurologie internationale", "international economics union / union assyriologique internationale", "international economic union / rencontre assyriologique internationale"
"international economic union / union astronomique internationale" » "international economic union / union economique internationale", "international economic union / union autonomie internationaler", "international economic union / union astronomy international", "international economics union / union astronomique internationale", "international economic union / icarien astronomique internationale"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international economic union / union astronomique internationale\") OR (\"international economic union / union assyriologique internationale\"))".
• Removing quotes may allow a broader search: (( international economic union / union astronomique internationale ) OR ( international economic union / union assyriologique internationale )).
• Adding a wildcard symbol may retrieve word variants: (("international economic union / union astronomique internationale") OR ("international economic union / union assyriologique internationale"))*.