Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"modified optimal solution algorithms" » "modified optimal solution algorithm", "modified optimal evolution algorithm", "modified optimal convolution algorithms", "modified thermal solution algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified optimal solution algorithms") OR ("modified multiobjective optimizer algorithms"))~.
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