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