Perhaps you should try some spelling variations:
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimization algorithms", "modified notion optimisation algorithm", "modified motion estimation algorithms"
"verified network optimized algorithms" » "verified network optimized algorithm", "verified network optimizer algorithms", "verified network optimization algorithms", "certified network optimized algorithms", "defined network optimized algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion estimation algorithms\") OR (\"verified network optimized algorithms\"))~".
• Removing quotes may allow a broader search: (( modified notion estimation algorithms ) OR ( verified network optimized algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified notion estimation algorithms") OR ("verified network optimized algorithms"))*.