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