Perhaps you should try some spelling variations:
"modified network approximation algorithm" » "modified network approximation algorithms", "certified network approximation algorithm", "defined network approximation algorithm", "modified near approximation algorithm"
"modified objective predation algorithm" » "modified objective allocation algorithm", "modified objective predators algorithm", "modified objective estimation algorithm"

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 predation algorithm") OR ("modified network approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified objective predation algorithm ) or ( modified network approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective predation algorithm") or ("modified network approximation algorithm"))*.