Perhaps you should try some spelling variations:
"modified risk optimization algorithms" » "modified risk optimisation algorithm", "modified risk estimation algorithms", "modified risk estimation algorithm", "modified robust optimization algorithms", "modified _ optimization algorithms", "modified game optimization algorithms", "modified bi1 optimization algorithms"
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"

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