Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"modified global optimisation algorithms" » "modified global optimization algorithms", "modified global estimation algorithms", "modified global estimation algorithm", "modified global optimization algorithmss", "modified global estimation algorithmss"

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