Perhaps you should try some spelling variations:
"modified bi1 approximation algorithm" » "modified bi1 approximation algorithms", "modified time approximation algorithm", "modified _ approximation algorithm", "modified one approximation algorithm"
"modified parameter optimized algorithms" » "modified parameter optimized algorithm", "modified parameter optimizer algorithms", "modified parameter optimization algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter optimized algorithms\") OR (\"modified bi1 approximation algorithm\"))~".
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