Perhaps you should try some spelling variations:
"modified staffing optimization algorithmss" » "modified staffing optimization algorithms", "modified staffing optimisation algorithm", "modified staffing estimation algorithms", "modified caging optimization algorithmss"
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective predation algorithm"

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