Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified notion estimation algorithmss" » "modified notion estimation algorithms", "modified notion optimization algorithms", "modified motion estimation algorithmss"

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