Perhaps you should try some spelling variations:
"modified write estimation algorithmssss" » "modified write estimation algorithms", "modified write estimation algorithm", "modified risk estimation algorithmssss", "modified pose estimation algorithmssss"
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimization algorithms") OR ("modified write estimation algorithmssss")).
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