Perhaps you should try some spelling variations:
"modified over optimization algorithms" » "modified over optimisation algorithm", "modified over estimation algorithms", "modified over estimation algorithm", "modified qoe optimization algorithms", "modified _ optimization algorithms", "modified game optimization algorithms", "modified near optimization algorithms", "modified orca optimization algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified over optimization algorithms") OR ("modified notion approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified over optimization algorithms\") OR (\"modified notion approximation algorithms\"))*".
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