Perhaps you should try some spelling variations:
"modified _ optimisation algorithms" » "modified _ optimization algorithms", "modified _ estimation algorithms", "modified _ estimation algorithm", "modified _ optimization algorithmss", "modified _ estimation algorithmss"
"modified parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter estimation algorithms"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ optimisation algorithms\") OR (\"modified parameter optimisation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified _ optimisation algorithms ) OR ( modified parameter optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified _ optimisation algorithms") OR ("modified parameter optimisation algorithm"))*.