Perhaps you should try some spelling variations:
"verified network approximation algorithm" » "verified network approximation algorithms", "certified network approximation algorithm", "defined network approximation algorithm"
"modified parameters estimation algorithms" » "modified parameter estimation algorithms", "modified parameter estimates algorithms", "modified parameter optimization algorithms", "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm"

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