Perhaps you should try some spelling variations:
"verified network optimization algorithms" » "verified network optimisation algorithm", "verified network estimation algorithms", "verified network estimation algorithm", "certified network optimization algorithms", "defined network optimization algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"verified network optimization algorithms\") OR (\"modified notion approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( verified network optimization algorithms ) OR ( modified notion approximation algorithms ))~.
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