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

You may be able to get more results by adjusting your search query.

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