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

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