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