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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("machines using raw algorithm") or ("modified multiobjective optimization algorithm"))~.
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