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