Perhaps you should try some spelling variations:
"modified parameters estimation algorithm" » "modified parameter estimation algorithm", "modified parameter estimates algorithm", "modified parameter optimization algorithm"
"modified qoe approximation algorithms" » "modified one approximation algorithms", "modified time approximation algorithms", "modified _ approximation algorithms", "modified male approximation algorithms", "modified bi1 approximation algorithms"

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