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

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