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 passive solutions algorithm" » "modified passive solution algorithm", "modified passive evolution algorithm", "modified passive evolutionary algorithm", "modified positive solutions algorithm", "modified adaptive solutions algorithm"

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