Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective approximation algorithms"
"modified static optimisation algorithm" » "modified static optimization algorithms", "modified static estimation algorithm", "modified static optimization algorithm", "modified stage optimization algorithm", "modified stochastic optimization algorithm"

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