Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified learning prediction algorithm" » "modified learning predation algorithm", "modified learning predators algorithm", "mobile learning prediction algorithm", "modified caging prediction algorithm"

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 learning prediction algorithm") OR ("modified multiobjective estimation algorithms"))~.
• Removing quotes may allow a broader search: (( modified learning prediction algorithm ) or ( modified multiobjective estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified learning prediction algorithm") or ("modified multiobjective estimation algorithms"))*.