Perhaps you should try some spelling variations:
"modified over estimation algorithms" » "modified over estimation algorithm", "modified over optimization algorithms", "modified over optimisation algorithm", "modified cover estimations algorithms", "modified pose estimation algorithms", "modified sphere estimation algorithms", "modified near estimation algorithms", "modified orca estimation 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 estimation algorithms") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified over estimation algorithms") OR ("modified notion approximation algorithms"))*.
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