Perhaps you should try some spelling variations:
"observations astronomical union / icarien astronomique internationale" » "observations astronomical union / icarien assyriologique internationale", "observations astronomical union / icarien autonomie internationaler", "observations astronomical union / icarien astronomy international", "observations astronomical union / cartes astronomiques internationale"
"international astronomical union / icarien economique internationale" » "international economics union / icarien economique internationale", "international economic union / icarien economique internationale", "international astronomical union / icarien economics international", "international astronomical union / icarien economy international", "international astronomical union / icarien politique internationale", "international astronomical union / crise economique internationale", "international astronomical union / situation economique internationale"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("observations astronomical union / icarien astronomique internationale") OR ("international astronomical union / icarien economique internationale")).
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