Perhaps you should try some spelling variations:
"certified network optimisation algorithm" » "certified network optimization algorithms", "certified network estimation algorithm", "certified network estimation algorithms", "certified network optimization algorithm", "verified network optimisation algorithm"
"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: "((\"certified network optimisation algorithm\") OR (\"modified notion approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( certified network optimisation algorithm ) OR ( modified notion approximation algorithms ))~.
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