Perhaps you should try some spelling variations:
"modified objective optimisation algorithmssss" » "modified objective optimization algorithms", "modified objective optimization algorithmsssss", "modified objective estimation algorithmssss", "modified objective estimation algorithmsssss", "modified objective optimization algorithmssss", "modified multiobjective optimization algorithmssss"
"modified _ optimisation algorithm" » "modified _ optimization algorithms", "modified _ estimation algorithm", "modified _ estimation algorithms"

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