Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified risk optimization algorithmss" » "modified risk optimization algorithms", "modified risk optimisation algorithm", "modified risk estimation algorithms", "modified robust optimization algorithmss", "modified _ optimization algorithmss", "modified game optimization algorithmss", "modified bi1 optimization 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 optimization algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithm ) OR ( modified risk optimization algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithm") OR ("modified risk optimization algorithmss"))*.