Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified location optimization algorithms"
"modified over approximation algorithms" » "modified one approximation algorithms", "modified average approximation algorithms", "modified _ approximation algorithms", "modified near approximation algorithms", "modified orca approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified allocation optimization algorithms\") OR (\"modified over approximation algorithms\"))~".
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