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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective optimization algorithms\") OR (\"modified static estimation algorithms\"))~".
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