Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified objective optimal algorithms" » "modified objective optimized algorithms", "modified objective optimizer algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified objective optimal algorithms") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimal algorithms") OR ("modified multiobjective optimization algorithms"))*.
• Removing quotes may allow a broader search: (( modified objective optimal algorithms ) or ( modified multiobjective optimization algorithms ))*.