Perhaps you should try some spelling variations:
"modified df optimization algorithmss" » "modified df optimisation algorithm", "modified df estimation algorithms", "modified df estimation algorithm", "modified df optimisation algorithms", "modified df estimation algorithmss", "modified _ optimization algorithmss", "modified qoe optimization algorithmss", "modified _ optimisation algorithmss", "modified adam optimization algorithmss", "modified bi1 optimization algorithmss"
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"

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