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"
"machine learning method algorithm" » "machine learning mom algorithm", "machine learning methods algorithm", "machine graining methods algorithm", "machine learning emotion 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: (("machine learning method algorithm") OR ("modified adam approximation algorithms"))~.
• Removing quotes may allow a broader search: (( machine learning method algorithm ) or ( modified adam approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("machine learning method algorithm") or ("modified adam approximation algorithms"))*.