Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified male optimization algorithm" » "modified male optimization algorithms", "modified male optimisation algorithm", "modified male estimation algorithm", "modified game optimization algorithm", "modified market optimization algorithm", "modified stage optimization algorithm"

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