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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimisation algorithm") OR ("verified network approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified objective optimisation algorithm ) or ( verified network approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimisation algorithm") or ("verified network approximation algorithm"))*.