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 raw algorithm" » "machines using raw algorithm", "machinery using adam algorithm", "machinery using _ algorithm", "machinery using mom algorithm", "machinery using real algorithm", "machinery using a algorithm", "machinery using low algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective optimization algorithm") or ("machinery using raw algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithm") OR ("machinery using raw algorithm")).
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