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