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

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified _ optimization algorithmsss") or ("modified multiobjective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified _ optimization algorithmsss") OR ("modified multiobjective optimization algorithm")).
• Removing quotes may allow a broader search: (( modified _ optimization algorithmsss ) or ( modified multiobjective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified _ optimization algorithmsss") or ("modified multiobjective optimization algorithm"))*.