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 parameters estimation algorithm" » "modified parameter estimation algorithm", "modified parameter estimates algorithm", "modified parameter 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 parameters estimation algorithm") OR ("modified network optimisation algorithms"))~.
• Removing quotes may allow a broader search: (( modified parameters estimation algorithm ) or ( modified network optimisation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameters estimation algorithm") or ("modified network optimisation algorithms"))*.