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