Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm", "modified multiobjective optimized algorithms"
"modified aging estimation algorithms" » "modified aging estimation algorithm", "modified aging optimisation algorithm", "modified aging approximation algorithms", "modified lighting estimation algorithms", "modified risk estimation algorithms", "modified caging estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified aging estimation algorithms") OR ("modified multiobjective optimization algorithms")).
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