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"
"mapping nursing method algorithm" » "mapping nursing mom algorithm", "impacting nursing method algorithm", "mapping learning method algorithm", "mapping nursing methods 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: (("mapping nursing method algorithm") OR ("modified objective optimization algorithms"))~.
• Removing quotes may allow a broader search: (( mapping nursing method algorithm ) or ( modified objective optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("mapping nursing method algorithm") or ("modified objective optimization algorithms"))*.