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