Perhaps you should try some spelling variations:
22international humanitarian » international humanitarian, international humanitair, internationale humanitare
international humanitaire » international humanitarian, international human

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22international humanitarian) OR (international humanitaire)) law%20 law of (armed OR aimed) conflict%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22international humanitarian) OR (international humanitaire)) law%20 law of (armed or aimed) conflict%22".
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