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