Perhaps you should try some spelling variations:
"modified optimal estimation algorithmss" » "modified optimal estimation algorithms", "modified optimal estimation algorithm", "modified optimal optimization algorithms", "modified optimal taxation algorithmss", "modified thermal estimation algorithmss"
"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 optimal estimation algorithmss") or ("modified multiobjective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified optimal estimation algorithmss") OR ("modified multiobjective optimization algorithm")).
• Removing quotes may allow a broader search: (( modified optimal estimation algorithmss ) or ( modified multiobjective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified optimal estimation algorithmss") or ("modified multiobjective optimization algorithm"))*.