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 thermal variation algorithm" » "modified thermal estimation algorithm", "modified thermal predation algorithm", "modified thermal estimation algorithms", "modified thermal evaporation algorithm", "modified thermal activation algorithm", "modified thermal oxidation algorithm"

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