Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"
"modified caging evolution algorithms" » "modified caging evolution algorithm", "modified caging convolution algorithms", "modified caging solution algorithm", "modified aging evolution algorithms", "modified changing evolution algorithms", "modified charging evolution algorithms"

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