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