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 pre algorithm" » "machinery using pre algorithm", "machines using mppt algorithm", "machines using qspr algorithm", "machines using _ algorithm", "machines nursing pre algorithm", "machines using one algorithm", "machines using ph algorithm"

Try widening your search to All Fields.

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