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

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

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