Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified market estimation algorithms" » "modified market estimation algorithm", "modified market optimization algorithms", "modified market optimisation algorithm", "modified parameter estimation algorithms", "modified male estimation algorithms"

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