Perhaps you should try some spelling variations:
"modified adam approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified df approximation algorithms", "modified near approximation algorithms"
"modified based estimation algorithm" » "modified pose estimation algorithm", "modified based investigation algorithm", "modified pulses estimation algorithm", "modified male estimation algorithm"

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