Perhaps you should try some spelling variations:
"modified df validation algorithm" » "modified df estimation algorithm", "modified df predation algorithm", "modified df estimation algorithms", "modified _ validation algorithm", "modified a validation algorithm", "modified adam validation algorithm", "modified bi1 validation algorithm"
"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 df validation algorithm") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df validation algorithm") OR ("modified notion approximation algorithms"))*.
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