Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"
"modified total optimisation algorithm" » "modified total optimization algorithms", "modified total estimation algorithm", "modified total estimation algorithms", "modified global optimization algorithm", "modified thermal optimisation algorithm", "modified ti6al4v optimisation algorithm"

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