Perhaps you should try some spelling variations:
intensity conflicts » identity conflict
28military science » military since
military sciences » auxiliary sciences, military sites, military defence

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %22low-intensity conflicts %((((28military science) OR (military science))) OR (military sciences))%29%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22low-intensity conflicts %((((28military science) OR (military science))) or (military sciences))%29%22".
• Adding a wildcard symbol may retrieve word variants: %22low-intensity conflicts %((((28military science) OR (military science))) or (military sciences))%29%22*.