Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified large variation algorithm" » "modified large estimation algorithm", "modified large predation algorithm", "modified large estimation algorithms", "modified large evaluation algorithm", "modified male variation algorithm"

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