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 changing estimation algorithmss" » "modified changing estimation algorithms", "modified changing estimation algorithm", "modified changing optimization algorithms", "modified channel estimation algorithmss", "modified charging station algorithmss", "modified caging 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 changing estimation algorithmss"))~.
• Removing quotes may allow a broader search: (( modified objective optimization algorithm ) or ( modified changing estimation algorithmss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithm") or ("modified changing estimation algorithmss"))*.