Perhaps you should try some spelling variations:
"modified based estimation algorithms" » "modified based estimation algorithm", "modified based optimization algorithms", "modified based optimisation algorithm", "modified pose estimation algorithms", "modified based investigation algorithms", "modified pulses estimation algorithms", "modified male estimation algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one 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 based estimation algorithms") OR ("modified notion approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified based estimation algorithms ) or ( modified notion approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified based estimation algorithms") or ("modified notion approximation algorithms"))*.