Perhaps you should try some spelling variations:
"modified objective optimisation algorithmss" » "modified objective optimisation algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective optimization algorithmss", "modified multiobjective optimization algorithmss"
"modified stochastic estimation algorithms" » "modified stochastic optimization algorithms", "modified stochastic estimation algorithm", "modified stochastic optimisation algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimisation algorithmss") OR ("modified stochastic estimation algorithms"))~.
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