Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"machines using one algorithm" » "machinery using one algorithm", "machines using our algorithm", "machines using _ algorithm", "machines using mom algorithm", "machines using open algorithm", "machines using pre algorithm", "machines using online algorithm"

Try widening your search to All Fields.

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