Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified risk optimisation algorithmss" » "modified risk optimisation algorithm", "modified risk optimization algorithms", "modified risk estimation algorithms", "modified _ optimisation algorithmss", "modified risk estimation algorithmss", "modified bi1 optimisation algorithmss"

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 multiobjective estimation algorithm\") OR (\"modified risk optimisation algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithm ) OR ( modified risk optimisation algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithm") OR ("modified risk optimisation algorithmss"))*.