Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithmssss" » "modified multiobjective optimization algorithmssss", "modified objective optimization algorithmssss", "modified multiobjective optimization algorithms", "modified multiobjective optimization algorithmsssss", "modified multiobjective estimation algorithmssss", "modified multiobjective estimation algorithmsssss"
"modified _ optimisation algorithm" » "modified _ optimization algorithms", "modified _ estimation algorithm", "modified _ estimation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ optimisation algorithm\") OR (\"modified multiobjective optimisation algorithmssss\"))~".
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