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