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