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

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