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