Perhaps you should try some spelling variations:
"modified location optimization algorithms" » "modified location estimation algorithms", "modified location estimation algorithm", "modified location optimized algorithms", "modified allocation optimization algorithms", "modified static optimization algorithms", "modified carbon optimization algorithms"
"modified notion optimisation algorithm" » "modified notion estimation algorithm", "modified notion estimation algorithms", "modified network optimization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion optimisation algorithm\") OR (\"modified location optimization algorithms\"))~".
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