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

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

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