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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimization algorithm") OR ("modified optimal estimation algorithmss"))~.
• Removing quotes may allow a broader search: (( modified objective optimization algorithm ) or ( modified optimal estimation algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithm") or ("modified optimal estimation algorithmss"))*.