Perhaps you should try some spelling variations:
"modified total estimation algorithms" » "modified total estimation algorithm", "modified total optimization algorithms", "modified total optimisation algorithm", "modified motion estimation algorithms", "modified pose estimation algorithms", "modified total variation algorithms", "modified thermal estimation algorithms", "modified ti6al4v estimation algorithms"
"modified objective optimized algorithm" » "modified objective optimal algorithm", "modified objective optimization algorithm", "modified objective optimized algorithms", "modified objective optimizer algorithms"

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