Perhaps you should try some spelling variations:
"modified allocation optimization algorithmss" » "modified allocation optimization algorithms", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified location optimization algorithmss"
"modified topology optimisation algorithm" » "modified topology optimization algorithms", "modified topology estimation algorithm", "modified topology estimation algorithms", "modified topology optimization algorithm", "modified policy optimization algorithm"

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