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