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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified risk optimization algorithmss") OR ("modified multiobjective optimization algorithm"))~.
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