Perhaps you should try some spelling variations:
"modified lighting optimisation algorithm" » "modified lighting optimization algorithms", "modified lighting estimation algorithm", "modified lighting estimation algorithms", "modified caging optimisation algorithm"
"modified bayesian estimation algorithmss" » "modified bayesian estimation algorithms", "modified bayesian estimation algorithm", "modified bayesian optimization algorithms", "modified bayesian optimization algorithmss"

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