Perhaps you should try some spelling variations:
"modified optimal optimization algorithmss" » "modified optimal optimization algorithms", "modified optimal optimisation algorithm", "modified optimal estimation algorithms", "modified optimal optimization algorithmsss", "modified optimal optimisation algorithmss", "modified optimal estimation algorithmss", "modified geometrical optimization algorithmss", "modified global optimization algorithmss", "modified thermal optimization algorithmss"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"

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