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