Perhaps you should try some spelling variations:
"modified time approximation algorithm" » "modified time approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified bi1 approximation algorithm", "modified male approximation algorithm"
"machine learning solution algorithm" » "machine learning evolution algorithm", "machine learning convolution algorithms", "machine learning evolutionary algorithm", "machine learning convolution 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 solution algorithm") OR ("modified time approximation algorithm"))~.
• Removing quotes may allow a broader search: (( machine learning solution algorithm ) or ( modified time approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("machine learning solution algorithm") or ("modified time approximation algorithm"))*.