Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"model learning predation algorithm" » "model learning predators algorithm", "model learning estimation algorithm", "model learning prediction algorithm", "model learning emotion algorithm", "mobile learning predation 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: (("model learning predation algorithm") OR ("modified notion approximation algorithms"))~.
• Removing quotes may allow a broader search: (( model learning predation algorithm ) or ( modified notion approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("model learning predation algorithm") or ("modified notion approximation algorithms"))*.