Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified carbon evolution algorithm" » "modified carbon solution algorithm", "modified carbon evolutionary algorithm", "modified carbon convolution algorithms", "modified co evolution algorithm", "modified early evolution algorithm"

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