Perhaps you should try some spelling variations:
"modified rough approximation algorithm" » "modified rough approximation algorithms", "modified rough approximations algorithm", "modified one approximation algorithm"
"modified df solution algorithm" » "modified df evolution algorithm", "modified df convolution algorithms", "modified df evolutionary algorithm", "modified _ solution algorithm", "modified adam solution algorithm", "modified bi1 solution algorithm", "modified drug solution algorithm", "modified up solutions 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 df solution algorithm") OR ("modified rough approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified df solution algorithm ) or ( modified rough approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified df solution algorithm") or ("modified rough approximation algorithm"))*.