Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"machines using methods algorithm" » "machinery using methods algorithm", "machines nursing methods algorithm", "machines making methods algorithm", "machines counting methods algorithm"

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 ("machines using methods algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithm") OR ("machines using methods algorithm"))*.
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) or ( machines using methods algorithm ))*.