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