Perhaps you should try some spelling variations:
"modified objective optimisation algorithm" » "modified objective optimization algorithm", "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"
"modified sphere optimizer algorithms" » "modified sphere optimized algorithms", "modified sphere optimized algorithm", "modified sphere optimization algorithms"

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