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

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