Perhaps you should try some spelling variations:
"modified notion optimisation algorithm" » "modified notion optimization algorithms", "modified notion estimation algorithm", "modified notion estimation algorithms", "modified network optimization algorithm"
"modified orca optimized algorithm" » "modified orca optimized algorithms", "modified orca optimizer algorithms", "modified dorca optimized algorithm", "modified orcad optimized algorithm", "modified ohca optimized algorithm"

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