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"
"defined network approximation algorithms" » "designed network 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: (("defined network approximation algorithms") OR ("modified based estimation algorithms"))~.
• Removing quotes may allow a broader search: (( defined network approximation algorithms ) or ( modified based estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network approximation algorithms") or ("modified based estimation algorithms"))*.