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 rbf algorithm" » "machinery using rbf algorithm", "machines using _ algorithm", "machines using mom algorithm", "machines using our algorithm", "machines using ibm algorithm", "machines using raw algorithm"

Try widening your search to All Fields.

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