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