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