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