Perhaps you should try some spelling variations:
"modified static estimation algorithms" » "modified static estimation algorithm", "modified static optimization algorithms", "modified static optimisation algorithm"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation 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 static estimation algorithms") OR ("modified df approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified static estimation algorithms ) or ( modified df approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified static estimation algorithms") or ("modified df approximation algorithms"))*.