Perhaps you should try some spelling variations:
"modified allocation estimation algorithmss" » "modified allocation estimation algorithms", "modified allocation optimization algorithms", "modified allocation optimization algorithmss", "modified motion estimation algorithmss"
"modified bayesian estimation algorithm" » "modified bayesian optimization algorithm"

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