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