Perhaps you should try some spelling variations:
"modified passive optimisation algorithmss" » "modified passive optimisation algorithm", "modified passive optimization algorithms", "modified passive estimation algorithms", "modified adaptive optimisation algorithmss"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective 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 objective allocation algorithms") OR ("modified passive optimisation algorithmss"))~.
• Removing quotes may allow a broader search: (( modified objective allocation algorithms ) or ( modified passive optimisation algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective allocation algorithms") or ("modified passive optimisation algorithmss"))*.