Perhaps you should try some spelling variations:
"modified trace optimisation algorithm" » "modified trace optimization algorithms", "modified trace estimation algorithm", "modified trace estimation algorithms", "modified game optimization algorithm", "modified stage optimization algorithm", "modified traces optimisation algorithm", "modified male optimisation algorithm", "modified orca optimisation algorithm"
"modified passive quantization algorithm" » "modified passive estimation algorithm", "modified adaptive quantization algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified passive quantization algorithm") OR ("modified trace optimisation algorithm"))~.
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