Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified ohca evolution algorithm" » "modified ohca solution algorithm", "modified ohca evolutionary algorithm", "modified ohca convolution algorithms", "modified co evolution algorithm", "modified orca evolution algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective optimization algorithm\") OR (\"modified ohca evolution algorithm\"))~".
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