Perhaps you should try some spelling variations:
"modified allocation estimation algorithms" » "modified allocation optimization algorithms", "modified motion estimation algorithms", "modified allocation estimation algorithm", "modified allocation optimisation algorithm"
"modified model predation algorithm" » "modified model predators algorithm", "modified model estimation algorithm", "modified model reduction algorithm", "modified model predictive algorithm", "modified model predicting algorithm", "modified male predation algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified model predation algorithm") OR ("modified allocation estimation algorithms")).
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