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

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