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

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