Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified near estimation algorithms" » "modified near estimation algorithm", "modified near optimization algorithms", "modified near optimisation algorithm", "modified seird estimation algorithms", "modified adam 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 near estimation algorithms") OR ("modified objective approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified near estimation algorithms ) or ( modified objective approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified near estimation algorithms") or ("modified objective approximation algorithm"))*.